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Tractor Pulling Discussion Forum

Re: How about a 900cid 4cyl for Natpa?

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Underdog Moline

03-10-2014 11:08:33

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That is only .55 HP/CI if/when it cranks out 500hp

Figure the new LSX has about .58 HP/CI and that is N/A

The 5.9 hemi .99 hp/ci the 6.2 is 1.16

Even a 1988 Dodge caravan with a 2.5L 4 cylinder was at .65 HP/CI

That means that it can be less efficient than a 1988 Caravan and conservatively make 500 HP!

OK one more just so I am being fair the 1985 Chevy Chevette was 97.7ci and 70hp giving it a .71 HP/CI not sure if that makes the Chevette better than the caravan or i have just confused everyone

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03-10-2014 11:18:43

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 Re: How about a 900cid 4cyl for Natpa? in reply to Underdog Moline, 03-10-2014 11:08:33  
We're making around 7hp per cube. Highly boosted 505 cid engine with an efficient cylinder head. But we're running at about 7 atmosphere's of pressure in the intake at the valve.
So does that mean it's 1hp per cube naturally aspirated on a 505 cid engine? It's not uncommon at all.

It comes down to how much air you can pack in a cylinder. Making the engine bigger isn't the answer if you can't feed it.

I love that intake setup!!
This post was edited by wi50 at 11:19:17 03/10/14.

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03-10-2014 11:36:53

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 Re: How about a 900cid 4cyl for Natpa? in reply to wi50, 03-10-2014 11:18:43  
I don't claim 500hp! Lol I do think 290-300 ish is more than realistic. Thanks Marty the aluminum is much easier to work with making the intakes. Plus its purty

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