Compression

[LOLO21]

Bonjour, quelle est la compression du moteur pour un taux de compression de 6,62:1 (m8 ltd 2014 es).
y a t'il un calcul ?
MERCI

 

[LOLO21]

Hi,

what is the engine compression for a compression ratio of 6.62:1 (m8 ltd 2014 es).
is there a calculation?
THANK YOU

 

[Old & slow]

https://calculator.academy/compression-ratio-calculator/image-112-2/#main

 

[LOLO21]

when I do the conversion formula I find 97 psi (https://calculator.academy/compression-ratio-to-psi-calculator/), that seems like a little to me. For a new motor I thought it was 140 psi there.
Someone can help me
THANKS

 

[Old & slow]

Your engine compression psi should be around 120-140. There are a lot of variables suck as elevation, atmospheric pressure, gauge accuracy, test method etc. This is why you see so many different numbers. To me its more important that the cylinders are the same side to side or with in a few psi. If you are trying to determine engine health a leak down test may be a better choice. If this is a new engine it needs to be broken in for accurate results. Those Suzuki 800 usually take around 500 miles to truly loosen up from new, a rebuild may be a bit quicker.

 

[LOLO21]

Thank you

 

[jarred kale]

Hi,

192.168.100.1 192.168.1.1​

what is the engine compression for a compression ratio of 6.62:1 (m8 ltd 2014 es).
is there a calculation?
THANK YOU

do you have the users manual ?

 

[LOLO21]

Yes

 

[kiliki]

And warm it up to operating temperature before doing the compression test.

 

[LOLO21]

I know but the problem is there, I just wanted to know how much compression is on a new 800 engine, on the manual it is written 6.62:1 compression ratio, but it does not specify the compression in psi, moreover the ratio/PSI conversion calculator finds me 97 psi for a new engine, I thought it was low for new...

 

[boondocker97]

Your engine compression psi should be around 120-140. There are a lot of variables suck as elevation, atmospheric pressure, gauge accuracy, test method etc. This is why you see so many different numbers. To me its more important that the cylinders are the same side to side or with in a few psi. If you are trying to determine engine health a leak down test may be a better choice. If this is a new engine it needs to be broken in for accurate results. Those Suzuki 800 usually take around 500 miles to truly loosen up from new, a rebuild may be a bit quicker.

My big bore compression tested ok, but the rings were starting to flake when I took it apart. Leak down might have shown that better.

 

[Anylizer]

I know but the problem is there, I just wanted to know how much compression is on a new 800 engine, on the manual it is written 6.62:1 compression ratio, but it does not specify the compression in psi, moreover the ratio/PSI conversion calculator finds me 97 psi for a new engine, I thought it was low for new...

Additionally, make sure you are holding the throttle WIDE OPEN when testing compression. It makes a big difference!!!