Help Compression Ratio For 62mm Bore

[FullThrottle T135]

I am new to compression ratios can someone enlighten me with this and for those who are experienced can you share whats the best compression for a 62mm bore t135?

to be used in daily/touring set up.

upon my observation I am still on low compression because my mech did something that I can still use my starter motor.


any advice please help. thanks

 

[Lecithine]

Subscribing..... Waiting for comment from other masters.

 

[FullThrottle T135]

Subscribing..... Waiting for comment from other masters.

Hoping fellow member notice this post.

Thinking of squishband and gasket removal. But still needs advice. And if its ok to remove unnecessary parts like sarter motor and its gears since i will be dependent on kick start.

 

[Fiel MX]

watch mode,, up up

 

[ianghol]

I am new to compression ratios can someone enlighten me with this and for those who are experienced can you share whats the best compression for a 62mm bore t135?

to be used in daily/touring set up.

upon my observation I am still on low compression because my mech did something that I can still use my starter motor.


any advice please help. thanks

62mm piston=stock head chamber..
can use e-start..
maybe your using stock camshaft or racing camshaft with decomp for easy start..

 

[FullThrottle T135]

I think so. I'm Using Cms cams right now since cms have decompression. thinking about removing it? could it add performance or should i replace cams with out Decompression?

 

[FullThrottle T135]

Current set up. Back to stock stroke from 6mm shark jack-up. Balanced stock crankshaft, high compression, decompression assembly removal, starter gear removal. Performance yet to be known. Hope i will not break it. Hehe. Lol.

 

[Fiel MX]

san ka nakakuha shark crankshaft bro?

 

[la velocidad]

Bro , dont be confused with the compression ratio and with your motorcycle low compression because they are totally different. Compression ratio is the value that represents the ratio of your engine max. Volume capacity and min. Volume capacity.
Its so simple bro,
1st - compute for the volume of your engine cylinder provided that the piston is at B.D.C.
2nd - compute for the volume of the engine with the piston at its T.D.C.

Now...

1st volume DEVIDED BY 2nd volume....
Equals the COMPRESSION RATIO of your yamahaT135 engine.
- the greater comp. Ratio the better engine performance because it allows the engine to extract more mechanical energy due to high thermal efficiency.
NOTE: higher compression ratio makes engine subject to engine detonation which may cause low engine efficiency and even engine damage.

Modified comp. Ratio must not exceed the design comp. Ratio of lcT135 engine.
I think i already reach the optimum comp. Ratio of my lc T135

... hope this will help you understand more about compression ratios...

 

[la velocidad]

1. Bro, dont be confused with the compression ratio and with your motorcycle low compression because they are totally different. Compression ratio is the value that represents the ratio of your engine max. Volumecapacity and min. Volume capacity.
   Its so simple bro,
   1st - compute for the volume of your engine cylinder provided that thepiston is at B.D.C.
   2nd - compute for the volume of theengine with the piston at its T.D.C.
   
   Now...
   
   1st volume DEVIDED BY 2nd volume....
   Equals the COMPRESSION RATIO ofyour yamahaT135 engine.
   - the greater comp. Ratio the betterengine performance because it allows the engine to extract more mechanicalenergy due to high thermal efficiency.
   NOTE: higher compression ratio makesengine subject to engine detonation which may cause low engine efficiency and even engine damage.
   
   Modified comp. Ratio must not exceedthe design comp. Ratio of lcT135 engine.
   I think i already reach the optimum comp. Ratio of my lc T135
   
   ... hope this will help you understand more about compression ratios...

 

[John Jordan]

View attachment 32210

Current set up. Back to stock stroke from 6mm shark jack-up. Balanced stock crankshaft, high compression, decompression assembly removal, starter gear removal. Performance yet to be known. Hope i will not break it. Hehe. Lol.

Bro, did you remove your base gasket on your current set? Are you using UMA Flat 62 or the UMA dome?

 

[John Jordan]

Bro , dont be confused with the compression ratio and with your motorcycle low compression because they are totally different. Compression ratio is the value that represents the ratio of your engine max. Volume capacity and min. Volume capacity.
Its so simple bro,
1st - compute for the volume of your engine cylinder provided that the piston is at B.D.C.
2nd - compute for the volume of the engine with the piston at its T.D.C.

Now...

1st volume DEVIDED BY 2nd volume....
Equals the COMPRESSION RATIO of your yamahaT135 engine.
- the greater comp. Ratio the better engine performance because it allows the engine to extract more mechanical energy due to high thermal efficiency.
NOTE: higher compression ratio makes engine subject to engine detonation which may cause low engine efficiency and even engine damage.

Modified comp. Ratio must not exceed the design comp. Ratio of lcT135 engine.
I think i already reach the optimum comp. Ratio of my lc T135

... hope this will help you understand more about compression ratios...

Bro, what is your current CR and engine set?

 

[Amad]

if i am not mistaken for daily use 12 to 13

 

[John Jordan]

if i am not mistaken for daily use 12 to 13

So, 12 to 13 is still advisable? Provided that a 98+ octane will be used?

 

[Amad]

So, 12 to 13 is still advisable? Provided that a 98+ octane will be used?

this is depending how you port your combustion chamber. for me there is no problem, and i use 97 octane. i had no issues. this is from my experience.