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post #1 of 13 Old 06-18-2006, 02:23 AM Thread Starter
Pizza Man!
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Hemi?

So, I seem to recall a Highschool science teacher telling me that a Hemi engine just has pistons that have hemispherical tops instead of flat. Does anyone know if there are Hemi pistons that would fit the I-6 block, or has anyone ever considered it? I have no intention of rebuilding my engine until it dies (or at the very leas not anytime soon since it's my DD and I have no money for a project like that anyway), I'm just curious.


99 XJ Sport, auto, np231s, sittin' stock K&N drop-in filter, ventshades.

And Yes I run pies in my XJ, and I don't know how the guy with the integra gets up those washed-out farm driveways.

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post #2 of 13 Old 06-18-2006, 12:49 PM
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i dont think it is the pistons that are round. i think its the head

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post #3 of 13 Old 06-18-2006, 02:43 PM
LEAD_NOT_FOLLOW
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Won't work....

You can't just change the piston setup and throw them into any motor. The convex/concave/flat head of a piston is almost the most important thing in engine design....
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post #4 of 13 Old 06-18-2006, 03:27 PM
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a hemi engine means that the heads have Hemispherical combustion chambers, (Half-sphere)...... that has to do with the heads, not the pistons, plus, your talking about a totaly different size piston and everything...... that is just simply not a very smart idea.....

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post #5 of 13 Old 06-18-2006, 04:34 PM
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So hypothetically is it safe to say that if someone out there made a 6 cylinder 4.0 hemi head for our engines, then we would have a true Hemi Jeep-Style

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post #6 of 13 Old 06-18-2006, 04:56 PM
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Quote:
Originally Posted by cammer427
So hypothetically is it safe to say that if someone out there made a 6 cylinder 4.0 hemi head for our engines, then we would have a true Hemi Jeep-Style
yes, hypothetically speaking, however, i doubt that will happen

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post #7 of 13 Old 06-18-2006, 06:58 PM
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the hemi combustion chamber, although it gives a better burn of the air/fuel, your not going to see that much more of a gain over a similiar, normal head.
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post #8 of 13 Old 06-18-2006, 07:00 PM
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Hemi is, as mentioned, just hemispherical heads with a TON of marketing behind them.

Other notable "HEMI" engines include the dog slow 4-banger in any '80s Dodge Omni
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post #9 of 13 Old 06-18-2006, 07:04 PM
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Quote:
Originally Posted by CNY_Jeep
Hemi is, as mentioned, just hemispherical heads with a TON of marketing behind them.

Other notable "HEMI" engines include the dog slow 4-banger in any '80s Dodge Omni
hemispherical combustion chamers are used by many more than chrysler....they can be found in numerous makes, the name HEMI is what chrysler uses
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post #10 of 13 Old 06-18-2006, 08:26 PM
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yeah my friends ford escort had a hemi engine. a crap little 4 cylinder with a hemispherical head

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post #11 of 13 Old 06-18-2006, 11:08 PM
white98xj
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alot of ford engines have semi-hemispherical heads.....but like teal mentioned, they dont make super high power gains, and for the price of a new head, you could do something that could make your jeep more powerfull

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post #12 of 13 Old 06-19-2006, 03:22 AM Thread Starter
Pizza Man!
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Ok, I though there might be a lot of marketing hype there, I was just wonderin'.

99 XJ Sport, auto, np231s, sittin' stock K&N drop-in filter, ventshades.

And Yes I run pies in my XJ, and I don't know how the guy with the integra gets up those washed-out farm driveways.

As always, my signature is a work in progress
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post #13 of 13 Old 12-03-2015, 11:45 AM
BenSmith2017
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Any changes on this yet? Hemi heads wouldn't be the most effective way to do things, but with the cam and the other upgrades I have might as well go all the way with this.
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