Compression of you cylinder...

[XPS1210]

Was reading and saw some thing from Zuma88 saying he was running a HIGH compression cylinder at 13:1 or something like that...

here is the compression specs from my new cylinder...


- Combustion chamber completely-designed to obtain a high compression ratio (15.8:1) with a very high turbulence.


This is SICK... 15.8:1 is crazy!

Definately a premium octain cylinder!


anyone else know their compression ratio?

[Zuma88]

15.8 is awesome. with my new race cylinder should be just above that if I don't bore my head out.

[scooterconvert]

15.8:1? Will you be able to get away with pump fuel?

[Zuma88]

I have been doing some research and if your compression ratio is to high it will give you a flat spot in your rpms.
2 stroke mag

[Lennox]

with too high of a compresion, I would be more worried about pre-detonation instead of a flat spot :rolleyes:

[Zuma88]

Correct. That is somthing that you could have to worrie about, expt MHR is made very well.

[Lennox]

- Combustion chamber completely-designed to obtain a high compression ratio (15.8:1) with a very high turbulence.

This is SICK... 15.8:1 is crazy!



remember, this cylinder is not stock!! It has been worked (hopefully, for Jered, correctly)

[Zuma88]

Yep. My stock cylinder 49.3cc (has been ported and polished) Has a cylinder compression ratio of 13.8.1.

[XPS1210]

You mmust have shaved the head down to get that high of compression on a stock 50cc case...

The compression ration I posted are of the stock MHR 70cc kit I ordered... Then the cylinder has been port and polished...

So this cylinder I got should ROCK!
:eek:

[marylandmark]

A stock MHR 70cc gives that?

WOW!

[Zuma88]

)(ecks yea. I do i the cylinder work, welding , and so on my self.
I polished my cylinder ports so well that I don't think super glue would stick lol.

[XPS1210]

15.8:1? Will you be able to get away with pump fuel?


I run 90 octain (the highest in anchorage) already...

Depending on how it feels and such I will look at adding higher grade fuel but I should be okay....

REmember the stock set up is only like 8.something to 1.... do it's almost double the stock! WOW!

Maybe the crank is also in my future!

[Zuma88]

It is 2x stock. stock is 7.2.1.

[XPS1210]

correct..

it's 7.2:1

Not sure why I was thinking it was 8.2:1... oh well...

anyway... Can't wait to get it... I love alaska SNAIL MAIL!

[speedy_scooter]

So I guess you never got an MHR kit? Or did you just get the Corsa/r instead? O yea, my compression is up at like 12.8:1 with 11.5hp.

[XPS1210]

Never got the malossi mhr stuff... did get the polini corsa/r kit instead... it's a 12:1 something cylinder...

however as you all know I am running a stock scooter...