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Compression level ?

  • Thread starter Thread starter GSX1100Norway
  • Start date Start date
G

GSX1100Norway

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Someone got experience of compression level for a "maximum" street engine that also can be used for "small" sunday rides ?
My engine is a _82 GSX 1100 E , with injection and stiffer WebCam springs and also WebCam camshafts + chain. This Cylinderhead are already ported a "little" and polished.
This winter i will rebuild this engine and replace parts thats needed and give it higher compression without killing it .
So if anyone have an idea wath level off compression that are "safe" i would be thankful...

Best Regards
Knut Kristiansen
Norway
 
Safe compression = factory compression, anything above is beyond its design...
 
skidMarkNZ said:
Safe compression = factory compression, anything above is beyond its design...
Click to expand...

And well within what it can handle long term.
Hugely overbuilt engines, go ahead and bump it up a bit.

But I have no specific number, ask a few of the engine gurus on here about it...
 
Cams with more duration will bleed off compression so it's safe to up the compression for this reason alone. Not sure how high you can go but the popular Wiseco big bore kits use 10.25 so that seems reasonable as long as you don't mind paying for premium gas.
 
Last edited:
The question IS how much do you want to spend on gasoline???

15-1 will work if you run 112 octane fuel and still have the stock ignition advancer unit..

13-1 is easy if you get 100 octane

12.5-1 on normal pump swill
 
Thanks
I read this like this engine are bulletproof up to at least 12,5 to 13 : 1 without any typical risk of damage. I`m an older guy, so I`m "normaly" drive safe and carfully, but still it`s I like to have fun sometimes and feel the "power".
So this bike are NOT going to be used on track or "racing".

Thanks to all...!!! :rolleyes:
 
If you aren't going to race it and have QUALITY gas available, I would max between 11.0 & 11.5 to 1 compression. Instead of higher compression, I would recommend you build a larger BORE engine. 82 mm bore makes a 1395 cc engine & at 10.25 to 1 compression you will be AMAZED at the torque gain! When I build street engines for my customers I ALWAYS prefer displacement to compression. They are easier on parts, more forgiving if you get a batch of bad fuel, & just are more durable & problem free. Ray.
 
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