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How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 12:49 pm
by jet1
I am thinking about a class that I have raced in the past but it is limited to 260 CI when using forced induction. I would have a host of options regarding different engines but cost and complexity comes into it. To be competitive I am looking at around 1000 hp at around 7500 rpm and would like to be able to run AV for fuel. So far the options I have thought about are going to the Toyota 2jz, 4 rotor Rotary, or destroke a GM ls 4.8 l. Any of these seem possible?

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 1:12 pm
by DaveMcLain
Yes its possible. Smokey Yunick made 1000 horsepower from a 209 inch Chevy V8 for Indy in about 1970.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 1:58 pm
by swampbuggy
Ahhhh Mr. black and gold was way ahead of his time wasn't he. God rest his soul.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 3:43 pm
by mekilljoydammit
All of those will do it with work. I'd lean towards the 4.8 - the most displacement you have the least hard you have to work everything, and more headbolts are always good. 2JZ is going to be more stressed but should still do it. 4-rotors are not production in anything ever - you're looking at around 20k by the time you have the longblock done, who knows what equivalency factor whatever racing org is giving, and tuning tends to be something a lot of people shy away from.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 4:16 pm
by Curtis Mc
Aussie Ford Bara 6?

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 5:16 pm
by 1972ho
https://youtu.be/QH4yh4TsP2w Here is a blown 260 cid on the dyno.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 5:23 pm
by hoffman900
They're making 300bhp in road race trim from turbo-charged 636cc I4s. This shouldn't be a problem.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 5:44 pm
by peejay
jet1 wrote:
Wed Nov 01, 2017 12:49 pm
I am thinking about a class that I have raced in the past but it is limited to 260 CI when using forced induction. I would have a host of options regarding different engines but cost and complexity comes into it. To be competitive I am looking at around 1000 hp at around 7500 rpm and would like to be able to run AV for fuel. So far the options I have thought about are going to the Toyota 2jz, 4 rotor Rotary, or destroke a GM ls 4.8 l. Any of these seem possible?
Take the four rotor engine off your list... granted it is peanuts to make 700+hp before turbos, but you're also looking at about $50k just for the block.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 5:48 pm
by ptuomov
How much can it weight and how large can the package be?

If you can destroke the 4.6L 4-valve DOHC modular Ford V8 from 90mm stroke and 281 CID to 80mm stroke and slightly under 260 CID, it's easy to get a low compression, hugely well flowing heads, and a lot of aftermarket parts. Then bolt two twin-scroll turbos to it and it's going to make a lot of power.

Re: How much power can I make from 260 CI

Posted: Wed Nov 01, 2017 6:04 pm
by Erland Cox
Is this for drag racing?

Erland

Re: How much power can I make from 260 CI

Posted: Thu Nov 02, 2017 3:44 am
by Sparksalot
Come on guys, cost dominates the question from the OP.

There are countless paths to make a modest 1000 hp from 260 cid. How much money is he prepared to spend on that quest?

Re: How much power can I make from 260 CI

Posted: Thu Nov 02, 2017 4:04 am
by cjperformance
Curtis Mc wrote:
Wed Nov 01, 2017 4:16 pm
Aussie Ford Bara 6?
Just what i was thinking!

Re: How much power can I make from 260 CI

Posted: Thu Nov 02, 2017 4:36 am
by kimosabi
I would destroke the LS 4.8. Hands down. Put twins on it. Been done before, or atleast a 4.8 have been way more than 1.000 hp.

Re: How much power can I make from 260 CI

Posted: Thu Nov 02, 2017 4:56 am
by joe 90
The bigger you go, the less boost you need so the less octane you need.

1000 HP from 2 litres has been done but 1000HP from 4 litres is half the stresses.
More cylinders is better.

Re: How much power can I make from 260 CI

Posted: Thu Nov 02, 2017 5:39 am
by hoffman900
At that rpm peak, you’ll want 4 valves. If you’re not limited by rules, you’ll want 4 valves per cylinder. Makes for a much wider power band.