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CX Customization and Modifications
Started by iceman37 at 02-23-2010 2:41 PM. Topic has 23 replies.
  
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 02-23-2010, 2:41 PM
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iceman37
 
Joined on 02-23-2010
Monessen, Pa
Posts 5
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How do I go about port and polish for 1980 Cx500?
The Nightcrawlers CX500 Mechanic
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02-23-2010, 3:01 PM
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BearCX
Joined on 03-11-2008
Roseworthy, Sth Aust
Posts 525
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Short answer.....not worth the effort.
Very small gains made. But if you got the time,..... or you could find a 650 CX engine. Sorry Mate, not helping I know.
If you're still in control...You're not going fast enough.
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02-23-2010, 4:08 PM
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PWG in Lowgap NC
Joined on 01-07-2008
Minutes from the Blue Ridge Parkway
Posts 2,380
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Bear is right. Unless you have absolutely nothing else to do, it's not worth the effort.
06 Suzuki S50 daily ride
CX500c
Honda Magna BC
age 72
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02-23-2010, 5:40 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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Have you made any other mods?
I think you will not see any meaningful gains unless you have opened up the intake and exhaust restrictions before this mod.
Then, you need to modify the ignition and most importantly, the valve timing (cam change via a different grid). Then you can rejet or put 35mm carps or bigger on the bike.
I'm guessing the change you are looking for is HP at the top end? If you could add 5% power... the net change would be similar to taking 18 lbs off the bike... the pound per HP would be tha same. It's cheaper to take off 18 lbs than add 2.5 HP... Besides you'd be reving the 30 year old bike up near the red line to enjoy the extra power. If you took the weight off, you'd get to enjoy the gain throughout the RMP range.
If you are itching for a HP gain, try Shep's electric fan swap. Much less effort and a true gain to be had.
Of course, there are some places that could run the heads through an extrude process to even the flow rate out between the cylinders - but that would not mean they removed material in the right spots to improve performance... Let us know what you're going to do.
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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02-23-2010, 5:53 PM
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Blindstitch
Joined on 03-14-2009
Greenfield Wisconsin
Posts 9,863
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Yeah I don't think it's worth it. Maybe you should focus on polishing off some port first and see if it's still a good idea.
1979 CX500 Supertanker
ATGATT makes riding a bike like a sled easier.
Quick Reference
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02-23-2010, 11:29 PM
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NightBiker07
Joined on 04-20-2009
Toledo, OH
Posts 506
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Porting, updated ignition, and updated carbs would probably yield a pretty big gain
80 CX 500
2000 CR 250 DIRT BIKE!!!!!!!!!!
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03-01-2010, 10:50 AM
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Doward
Joined on 05-11-2008
Alachua, FL
Posts 814
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ARG!! NITROUS OXIDE - NOS IS A HOLLEY BRAND NAME!
/rant
Sorry, ever since Fast and the Furious came out... ugh what a pet peeve :)
That said, no way in hell would I run nitrous on 30 year old casting technology (regarding the pistons) It would be a blast with some forged slugs, though!
1978 CX500 motor + 1980 CX500C frame
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03-01-2010, 7:58 PM
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NoXi
Joined on 08-04-2008
UND
Posts 308
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me and a buddy once put a 250 shot of nitrous through an 84 honda accord and then jumped it.
you can do anything if you put your mind to it!
82 gl 500 silverwing (dizzy)
82 gl 500 interstate (the brown streak)
81 susuki gs550 (suzy (chopper))
99 R6 chop project (ace of speed)
Tell me the location and velocity of every particle in the universe and ill tell you your future
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03-01-2010, 9:49 PM
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NightBiker07
Joined on 04-20-2009
Toledo, OH
Posts 506
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 Doward wrote: | ARG!! NITROUS OXIDE - NOS IS A HOLLEY BRAND NAME!
/rant
Sorry, ever since Fast and the Furious came out... ugh what a pet peeve :)
That said, no way in hell would I run nitrous on 30 year old casting technology (regarding the pistons) It would be a blast with some forged slugs, though!
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yep, you can watch the motor shatter into a million pieces......
80 CX 500
2000 CR 250 DIRT BIKE!!!!!!!!!!
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03-02-2010, 3:30 AM
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BearCX
Joined on 03-11-2008
Roseworthy, Sth Aust
Posts 525
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You can install Nitrous on any internal combustion engine. But, it must have a good,solid bottom end. As Nitrous can only be used at WOT. (wide open throttle) Also, remember that with the added intake, you must have improved fuel delivery.
100 HP in a bottle.
Try a shot on your Mower, Chainsaw, Weed Wacker etc.
If you're still in control...You're not going fast enough.
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03-03-2010, 1:19 PM
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NightBiker07
Joined on 04-20-2009
Toledo, OH
Posts 506
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You dont have to be at WOT for Nitrous to have an effect.
Nitrous is an oxidizer, much like Oxygen. by itself, it is harmless, but toss it into a fire (or a running motor) and it makes the fuel burn much more rapidly and efficiently. hence, you can burn more fuel at once without it running rich, because there is now a higher ratio of oxidizer.
say, for example, atmospheric gas (air) that gets sucked into the motor only has .5% oxidizer. therefore at a set ratio (example 5:1), you can have 2.5% fuel to be running at stoichiometric efficiency. Now you throw a 50 shot of nitrous into the motor, there is now a 5% oxidizer ratio in the motor. Now, you can throw 25% fuel into the motor, and it will burn at stoichiometric efficiency. take the nitrous away, and you are now running way too rich.
I have no idea what the ratios or percentages are, this is just meant as an example of WHY the motor needs more fuel with nitrous.
Therefore, it will provide power gains in ALL RPM ranges. the WOT boost is only of you set it up to turn on when you spin the throttle to WOT. it makes the most sense to do this, but it can be set up to activate wherever and whenever you want.
80 CX 500
2000 CR 250 DIRT BIKE!!!!!!!!!!
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03-03-2010, 4:12 PM
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WisconsinCX
Joined on 07-07-2008
Germantown, WI
Posts 772
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OR, just go buy a CBR600RR
Only 100cc bigger but a possible gain to 118hp.
83 CB1100F Super Sport
No Twins at this time. :( Went through about 12 of them tho!
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03-03-2010, 4:29 PM
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CXSarnia
Joined on 01-11-2008
Sarnia, Ontario, Canada
Posts 2,623
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| BearCX wrote: | Short answer.....not worth the effort.
Very small gains made. But if you got the time,..... or you could find a 650 CX engine. Sorry Mate, not helping I know.
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In fact, just the opposite may be true, you be the judge, there is an article here that dispels the myth of intake porting being beneficial... it's an interesting read.
2009 DN-01 Spakin' New!
1982 CX500 Turbo & Parts bike
1981 SL185 Yamaha Exciter
198? V45 Magna
1979 CX500 Deluxe
1982 CB750K Daily rider September 1999
1982 CX500 Custom - project Originally bought April 1982 safetied and on the road 09/2008
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03-03-2010, 6:47 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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Okay, some interesting reading.
For me, I believe the factory - or other organizations with the right tools can figure out how to get more power out of an engine. I do believe the more air I can get through the engine = more power because I know I can add more fuel to mix with the increased air. The trick is to do this throughout the RPM range to make the most useful power - who drives at 9,000 RPM ALL the time?
For our motor, we can only play with a few variables. It would be really nice if someone could hook up our engine to measure the effect of different mods to increase the air flow through the engine at different RPMs.
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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03-05-2010, 12:15 PM
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CXSarnia
Joined on 01-11-2008
Sarnia, Ontario, Canada
Posts 2,623
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I'm pretty sure, the Honda factory staff did quite a few 'trial and errors' in trying to discover the best possible outcome prior to production. I'm sure they had the best techs and equipment to work on it.
On a similar note, I watched an article on television a while back about the ford truck design team. They had a focus group of people sitting in a room, listening to different engine/exhaust sounds - they were looking for the "best sounding exhaust". The one that the panel decided on - was what the design team would then work towards. After doing that, they had to "De-tune" the truck's exhaust to acheive the perceived "best sound". Their marketing people were convinced the 'sound' of the truck is what sold it. Actual Performance was only secondary. I was speachless.
2009 DN-01 Spakin' New!
1982 CX500 Turbo & Parts bike
1981 SL185 Yamaha Exciter
198? V45 Magna
1979 CX500 Deluxe
1982 CB750K Daily rider September 1999
1982 CX500 Custom - project Originally bought April 1982 safetied and on the road 09/2008
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03-08-2010, 7:45 AM
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motrhead
Joined on 10-06-2007
Posts 6
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<BLOCKQUOTE><table width="85%"><tr><td class="txt4"><img src="/cs/Themes/default/images/icon-quote.gif"> <strong>CXSarnia wrote:</strong></td></tr><tr><td class="quoteTable"><table width="100%"><tr><td width="100%" valign="top" class="txt4">I'm pretty sure, the Honda factory staff did quite a few 'trial and errors' in trying to discover the best possible outcome prior to production. I'm sure they had the best techs and equipment to work on it.
</td></tr></table></td></tr></table></BLOCKQUOTE>
But remember...these bikes are made to suit an average user, and made to meet a price. If you have more specific needs, like more hi-rpm horsepower, the stock engine can be improved upon.
I have never really checked out the ports in these heads too close, but polishing the exhaust ports and streamlining the guides couldn't hurt. I agree with leaving the intakes alone and not enlarging anything. I'm no expert, but I do own a die-grinder and have messed with a few engines. ;-)
The more important question would be: does anyone make performance camshafts for these engines? I know Megacycle no longer makes one. There are CX bikes running at Bonneville. Someone must be making the cams.
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03-08-2010, 7:47 AM
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motrhead
Joined on 10-06-2007
Posts 6
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What is going on with my quotes? This doesn't happen on any of the other twenty or more various forums that I post on.
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03-08-2010, 7:21 PM
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Spacetiger
Joined on 05-16-2009
Chantilly, VA
Posts 1,353
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motrhead,
Do you think they are making cams, or regriding cams for slight changes to valve open/closing.
Jerry
90 PC 800 (commuting steed)
82 GL500I (50+mpg, great bike)
66 BMW R 50/2 (No brakes/HP)
80 CX500C (Loved this bike)
74 CB360 (Fun; but too small)
79 CX500D (40,000+ mi in 3 years)
76 CB550 (step up from 200cc)
74 KZ200 (1st bike!)
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Report
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03-08-2010, 11:05 PM
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NightBiker07
Joined on 04-20-2009
Toledo, OH
Posts 506
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| CXSarnia wrote: | | I'm pretty sure, the Honda factory staff did quite a few 'trial and errors' in trying to discover the best possible outcome prior to production. I'm sure they had the best techs and equipment to work on it. . |
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yep, I bet they did have some high-tech staff on the design of the engine. But that was 30 years ago. just by updating a few key components to modern technology would produce sufficient gains, without getting too involved.
hell, single cylinder 450's push over 50HP now. they dont hold together worth a shit though. These CX motors have stood the test of time, thats for sure.
80 CX 500
2000 CR 250 DIRT BIKE!!!!!!!!!!
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04-30-2010, 5:24 PM
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gingwhaa
Joined on 05-01-2010
Posts 2
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Well it can be worth it if you want some more power in low end midrange, and you know how to do it. I have a past with cyl heads and can't help myself to work over my lawnmowers too. I just did my own gl500 and put the 650 transmission in it. It actuallly has a little more pulling power even with the tall gear ratios. Although I did advance the cam about 8 degrees too. I am not a revver and this is a touring bike anyway. Mileage jumped way up too. Gotta have good carbide bits with long reach to do it right... I never had complains of lost low end power from any heads I modified.
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05-02-2010, 1:41 AM
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TonyG
Joined on 04-05-2006
Central Pa
Posts 745
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Would love to see pics of the port/polish job.
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05-29-2010, 6:54 AM
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gingwhaa
Joined on 05-01-2010
Posts 2
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Yeah do not polish though. Rough and fuzzy is better. wavy is bad even when smooth. the air gets confused. straight and scrolled finish is better atomizer. I am getting 60 mpg now with my mods. I bought a mac header and a uni foam. went a tiny bit up on m jets but left the needles. This is/ was a Gl500.
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05-30-2010, 4:54 AM
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BearCX
Joined on 03-11-2008
Roseworthy, Sth Aust
Posts 525
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Agreed. Unless you're gonna run Top Alcohol bike in the next Drag titles. Smooth is bad. Fuel flowing too slowly will stick to the shiny surface and could run down the walls. Needs a bit of turbulence.
If you're still in control...You're not going fast enough.
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Honda CX500 & G... » CX500 GL500 Tra... » CX Customizatio... » Port and polish
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