Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: Chargervic]
#1355349
12/21/12 08:52 AM
12/21/12 08:52 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Cool... now do me a favor and post up your dyno sheet... I'm trying to compare your numbers thanks
It's all up there already. The post with the flashing red and green Pentastar.
I'm more concerned with the other numbers, fuel, oil temp,egt, and the other things that the dyno would read....I have a engine very close to yours in my 38 and want to compare thanks
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: MR_P_BODY]
#1355350
12/21/12 09:23 AM
12/21/12 09:23 AM
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Joined: Jan 2003
Posts: 8,225 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,225
Plymouth, MI
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Unrelated from the power discussion, I have to commend you, that is an absolutely beautiful '68. It could have a /6 in there and you should still be proud of that thing!
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: MR_P_BODY]
#1355353
12/21/12 10:49 AM
12/21/12 10:49 AM
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Joined: Mar 2007
Posts: 3,300 Northern Indiana
Dunnuck Racing
master
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master
Joined: Mar 2007
Posts: 3,300
Northern Indiana
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Quote:
Quote:
Quote:
Cool... now do me a favor and post up your dyno sheet... I'm trying to compare your numbers thanks
It's all up there already. The post with the flashing red and green Pentastar.
I'm more concerned with the other numbers, fuel, oil temp,egt, and the other things that the dyno would read....I have a engine very close to yours in my 38 and want to compare thanks
He stated in his post that the numbers for his engine were from Desktop Dyno. He wont have the other info Mr. P
Keith
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: MR_P_BODY]
#1355355
12/21/12 01:16 PM
12/21/12 01:16 PM
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Joined: May 2003
Posts: 6,621 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,621
Downtown Roebuck Ont
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Sounds like he is quoting a chassis dyno. He says the torque # could be skewed because of his converter which certainly makes sense. Was the 496 done on the same dyno? Same heads cam and intake with 40 odd more cubes should make the same numbers, just at a lower RPM. A different dyno might explain the discrepancy. Oh and that Charger is gorgeous. Kevin
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: Twostick]
#1355356
12/21/12 01:58 PM
12/21/12 01:58 PM
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Joined: Jul 2009
Posts: 413 Norway (old world)
Oyvind Mopar
mopar
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mopar
Joined: Jul 2009
Posts: 413
Norway (old world)
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Hi torque at low rpms is what the auto industry tries to make. And the recipe is long tubes manifold with FI,and free flowing exhaust tuned if possible to low rpms. Good flowing heads make up for the modest cam in the upper rpms. It is much easier for a hobbyist to achieve the high torque in somewhat higher rpms, as ram tuning then does not demand insanely long tubes, and commercial headers are on the spot. This is what makes me wonder how the 600 lbs can be achieved with the described combination at those low rpms. (And do not forget: 500++ lbs down below will also kick butt!!) Is the 2-barrel intake path in the 6-p setup so efficient? This is not criticism, but I am not sure if it is correct. Please allow me to make such a comment, as I struggle for the best results myself (knowing how hard it is to hit correctly), and I am always interested in new-thinking. Maybe the desktop dyno has a black spot down low rpms (like calculating high VE due to "ram tuning")? And, I would really like to get some tips, as I live in a dark side of the world with pumped up gas taxes, and heavily taxed modern cars (but not the old ones!) so making engines this way is somewhat of a target. If, for nothing else, to feel the torque and hear the sweet V8 rumbling.... And, I have been working with Mopars since 1973, but I am not an "expert" (LOL)
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: cudaman1969]
#1355363
01/02/13 10:26 AM
01/02/13 10:26 AM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Not what I wanted to hear so i'll go with higher compression and roller cam, thanks
probaby be easier and cheaper with a supercharger. Buy a used or re-manned Chevy/Furd unit off of e-bay modify the main bracket and roll. You can use whatever you have now. You can also use a lower gear 3.55-3.73. Not sure it will match the mpg of a 6-pack but it should get you close to 17hwy.
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Re: 68 Charger 451 engine build 25 MPG and 515 HP
[Re: cudaman1969]
#1355366
01/02/13 08:52 PM
01/02/13 08:52 PM
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Joined: Oct 2011
Posts: 559 Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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Camshaft and cylinder heads were the reason it did as well as it did. The 452 heads were flowing in excess of 290 cfm. Later, with 906 heads and the same compression, it was making 694 HP. Both configurations were running on 91 octane. Would it make more with higher compression? Sure!
Last edited by heyoldguy; 01/02/13 08:53 PM.
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