350cc 11hp Compression

Quadmaster · 11-08-2008, 02:00 AM

I have 175lbs of compression in each cylinder. Is that good ?? I have adjusted the valves already.

Is this good, bad, soso, I guess I'm looking for a bench mark to go by. Thanks

Subarumouse · 11-08-2008, 07:03 AM

Hello Quadmaster,

I gave an answer with wrong measurements.

My nummbers are in PSI and not LBS.
175 PSI = 12.5 BAR 190 = 13.5 Bar
I don't know how much LBS = PSI = BAR

I don't know your factorycompression, but 175 is good????????
More than 185 /190 is on long terms getting a problem for your (thing between piston and cranckshaft).
Or is simply to much because of detonation in these simple engines.

175 measured with a reliable precisioninstrument is just passed the edge of using 98 octane gas.
Just because of predetonation.
Ours has 190 and we are using at least 98 octane and digital ignition

Benno

Quadmaster · 11-08-2008, 12:13 PM

My mistake, it was late last nite when i was posting....My numbers are PSI. It's the connecting rod that's affected with too much compression. Thanks

Anyone know what kind off compression a 295 head will have on a 350cc ??

pizzamaker · 11-08-2008, 05:00 PM

if your at 175lbs then you would be looking at around 185 to 190

mikesmotortoys · 11-08-2008, 05:59 PM

You're right on the money!

Quadmaster · 11-08-2008, 06:48 PM

Hey guys , Pizzamaker & Mike In your opinion is it worth doing the 295cc head for some more oomph ???? Not necessarily speed ...I have a 92 and it doesn't seem to have a rev limiter.

todwil · 11-08-2008, 08:22 PM

Quote:

Originally Posted by Quadmaster

Hey guys , Pizzamaker & Mike In your opinion is it worth doing the 295cc head for some more oomph ???? Not necessarily speed ...I have a 92 and it doesn't seem to have a rev limiter.

Thats a good way to gain power it ups the compression but you'll
have to run 93octane!!!!

Quadmaster · 11-08-2008, 08:25 PM

Todwil, I don't mind the fuel, I've read it will give me about 7 - 9 hp increase...??? Any thoughts ??????

todwil · 11-08-2008, 08:32 PM

I thinking about 3-4 more pony's but thats just a guess I did this before
I switched to a biggest block, definite power gain you can feel with a
BUTDYNO!!!!

Quadmaster · 11-08-2008, 08:37 PM

Todwil, THANKS Great info, I think I will try this. Did you use the 350cc cam ?

11-08-2008, 02:00 AM	#1
Quadmaster Gone Wild Join Date: Oct 2008 Location: Out past the Creek, Arizona Posts: 856	350cc 11hp Compression I have 175lbs of compression in each cylinder. Is that good ?? I have adjusted the valves already.Is this good, bad, soso, I guess I'm looking for a bench mark to go by. Thanks

11-08-2008, 07:03 AM	#2
Subarumouse Gone Wild Join Date: May 2008 Location: Netherlands (Europe) Posts: 170	Re: 350cc 11hp Compression Hello Quadmaster, I gave an answer with wrong measurements. My nummbers are in PSI and not LBS. 175 PSI = 12.5 BAR 190 = 13.5 Bar I don't know how much LBS = PSI = BAR I don't know your factorycompression, but 175 is good???????? More than 185 /190 is on long terms getting a problem for your (thing between piston and cranckshaft). Or is simply to much because of detonation in these simple engines. 175 measured with a reliable precisioninstrument is just passed the edge of using 98 octane gas. Just because of predetonation. Ours has 190 and we are using at least 98 octane and digital ignition Benno Last edited by Subarumouse; 11-08-2008 at 09:33 AM.. Reason: Not the right answer!

11-08-2008, 12:13 PM	#3
Quadmaster Gone Wild Join Date: Oct 2008 Location: Out past the Creek, Arizona Posts: 856	Re: 350cc 11hp Compression My mistake, it was late last nite when i was posting....My numbers are PSI. It's the connecting rod that's affected with too much compression. Thanks Anyone know what kind off compression a 295 head will have on a 350cc ?? Last edited by Quadmaster; 11-08-2008 at 12:15 PM.. Reason: more info

11-08-2008, 05:00 PM	#4
pizzamaker ****tard supreme Join Date: Jun 2008 Location: waldo,wisconsin Posts: 5,401	Re: 350cc 11hp Compression if your at 175lbs then you would be looking at around 185 to 190

11-08-2008, 05:59 PM	#5
mikesmotortoys Gone Wild Join Date: Mar 2008 Location: Rockwall, Texas (Dallas / Ft. Worth) Posts: 7,077	Re: 350cc 11hp Compression You're right on the money!

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11-08-2008, 06:48 PM	#6
Quadmaster Gone Wild Join Date: Oct 2008 Location: Out past the Creek, Arizona Posts: 856	Re: 350cc 11hp Compression Hey guys , Pizzamaker & Mike In your opinion is it worth doing the 295cc head for some more oomph ???? Not necessarily speed ...I have a 92 and it doesn't seem to have a rev limiter. Last edited by Quadmaster; 11-08-2008 at 06:53 PM.. Reason: more info

11-08-2008, 08:25 PM	#8
Quadmaster Gone Wild Join Date: Oct 2008 Location: Out past the Creek, Arizona Posts: 856	Re: 350cc 11hp Compression Todwil, I don't mind the fuel, I've read it will give me about 7 - 9 hp increase...??? Any thoughts ??????

11-08-2008, 08:32 PM	#9
todwil TOD WILD Join Date: Nov 2007 Location: YUMA AZ Posts: 666	Re: 350cc 11hp Compression I thinking about 3-4 more pony's but thats just a guess I did this before I switched to a biggest block, definite power gain you can feel with a BUTDYNO!!!!

11-08-2008, 08:37 PM	#10
Quadmaster Gone Wild Join Date: Oct 2008 Location: Out past the Creek, Arizona Posts: 856	Re: 350cc 11hp Compression Todwil, THANKS Great info, I think I will try this. Did you use the 350cc cam ?

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