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#11 Re: Fuel types, what works and what doesnt.
Clive Posted on: 2008/5/23 11:28
So most of you guys dont believe in high compression ratio's with a high octane fuel to make up for power?


#12 Re: Fuel types, what works and what doesnt.
1200GXman Posted on: 2008/5/23 12:09
Quote:
So most of you guys dont believe in high compression ratio's with a high octane fuel to make up for power?


Not a chance. I 100% believe to get more power after flowing head,balance bottom end,carbs,etc you up the comp to get more power. I have seen and heard of alot of engines and came to a conclusion that comp can increase power, especially torque.
Some examples:
My friend here at work's nephew bought a factory 95 Nissan Sentra Works rally car build by Nissan motorsport.It has a SR20DE motor that has been worked with the following:
Full head job.
Rally spec cam.(Anything from 300 to 320 degrees)
Balance job (Revved to 8500 with rally team)
Throttle bodies.
And a comp of something like 13 : 1.
Apparently according to the factory it made 190 to 200Kw.Can't remember if it is flywheel or wheel Kw.
They are going to drop comp to 11 : 1 to increase reliability and decrease engine wear.
I know of a Sabre with head job, mild cam and it makes 150Kw.

Another example is Minnesh's 1200 in Durban. Has all the standard stuff done to the engine and a MASSIVE comp. I think also 13 : 1. It also gives 2litre guys a go and it is a 1400cc engine.
If you want, I can give you his number and then you can chat to him.Very helpful guy.

If I were you I would keep the comp down to use 95 pump fuel.Why? The damn fuel price is going to keep going up and race fuel is very expensive.
I would recommend 10,5 : 1. This is on the edge to be safe. For this I think you will have to check your pistons or skim the GX head to max which I would not recommend as they are very valuable.


#13 Re: Fuel types, what works and what doesnt.
Clive Posted on: 2008/5/23 18:52
Nice info. But what i'm thinking is... Building an engine with race'ing writen all over it, you might aswell go all the way. a Proper stroker with flat tops and a fully done head and my old setups 300deg cam should go hard and maybe one will enjoy it a bit more if and when its driven. My comp was 11: 1...


#14 Re: Fuel types, what works and what doesnt.
kululadotgroen Posted on: 2008/5/23 22:51
Quote:

Clive wrote:
So most of you guys dont believe in high compression ratio's with a high octane fuel to make up for power?


Ofcourse you will get more benefit if you run high octane fuel in a high compression engine. You can run more timing, less fuel and all sorts of stuff. You will make more power. I was just saying, on a well sorted engine with high compression, and I'm talking probably not higer than 11:1, high octane is not compulsory...


#15 Re: Fuel types, what works and what doesnt.
kululadotgroen Posted on: 2008/5/23 22:54
Quote:

Clive wrote:
Nice info. But what i'm thinking is... Building an engine with race'ing writen all over it, you might aswell go all the way. a Proper stroker with flat tops and a fully done head and my old setups 300deg cam should go hard and maybe one will enjoy it a bit more if and when its driven. My comp was 11: 1...


Going all the way means going all the way, then you might as well run it on 102 if you could find any, or afgas and I think the new racing fuel is 98... Your original question was what type of fuel do you need to run on a high compression engine, and my answer was, it doesn't matter, if you sort it probably it'll run on any fuel...



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