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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Question on 502 compression ratio, octane (https://www.offshoreonly.com/forums/general-q/181604-question-502-compression-ratio-octane.html)

scarabfun 03-07-2008 03:35 PM
hey hows that magnum run? my buddy had a 27' t-sblocks, great boat.

Griff 03-07-2008 03:53 PM
I think you could easily run 89 octane with 9.1 CR and aluminum heads.

Also confuse don the specs. Valve sizes are wrong, as well as head chamber size says 218 cc.

The emi's should be fine, but you need to find out what the lobe sep is on the cam to make sure. It needs to be 110 or higher.

BY U BOY 03-07-2008 04:34 PM
Originally Posted by Griff (Post 2475662)
I think you could easily run 89 octane with 9.1 CR and aluminum heads.

Also confuse don the specs. Valve sizes are wrong, as well as head chamber size says 218 cc.

The emi's should be fine, but you need to find out what the lobe sep is on the cam to make sure. It needs to be 110 or higher.
Lobe on the cam is 110 and you are right the heads should be 110, which is going to bring the ratio up to about 9.8:1

31scarab31 03-07-2008 06:06 PM
Seef158, take a look at classified Ad Number: 20702

31scarab31 03-07-2008 06:07 PM
BY U BOY, HOW CAN I FIND THE SCARAB LOGO THAT YOU HAVE? [email protected]

seef158 03-07-2008 06:52 PM
Originally Posted by 31scarab31 (Post 2475875)
Seef158, take a look at classified Ad Number: 20702
Not too crazy about a used engine, don't want to buy someone's headache.

31scarab31 03-07-2008 07:06 PM
No problem I understand, but absolutely no hedaches. I finally am getting my new 555ci's finished, 2 year process!

Good luck with what ever you decision may be. Summer is almost here! Have fun this year on the water!

BY U BOY 03-07-2008 11:41 PM
Originally Posted by 31scarab31 (Post 2475877)
BY U BOY, HOW CAN I FIND THE SCARAB LOGO THAT YOU HAVE? [email protected]
go to http://www.wellcraft.com/ click on online store scroll down to Scarab and click on it and you will see it.

31scarab31 03-08-2008 10:03 AM
Thank you By U Boy!!

BY U BOY 03-08-2008 10:14 AM
Originally Posted by 31scarab31 (Post 2476509)
Thank you By U Boy!!
No problem.


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