How does the Hemi compare?
- Thread starter wrenchinrandy
- Start date
Tomcat
Well-Known Member
I'm on my way to swapping a 392 into my 71 Satellite / roadrunner clone.....I know it's not going to have the gut wrenching feel of an old school big block, but I plan to leave it box stock for turn key reliability and little to no wrenching to keep it going.....I think that is the biggest reason for the resto mod movement.
mmissile
Well-Known Member
The 6.4 in my `cuda is so deceptive. The driveline is supposed to be in a car a thousand pounds heavier, with all the nanny limitations. I literally had it get away from me once. I truly respect what Chrysler did.....when put in a non-limited platform. This may be the only driver-car I've had, that I truly "respect". My 300C is so much tamer and more numb feeling. It also isn't nearly as crazy and fun. Make no mistake...it is a subtle-beast.
PA_65_Plymouth
Well-Known Member
I really feel a lot of people don’t realize that just because it doesn’t sound like an old wedge or maybe have the torque out of the hole that Gen3s are dogs…. Ride in one that’s all I gotta say.
mmissile
Well-Known Member
This will get people in trouble. Stupid low-end power. The Smooth power and torque combined with the trans ratios...
NAG-1 ratios | |
| gear | ratio |
| 1 | 3.59 |
| 2 | 2.9 |
| 3 | 1.41 |
| 4 | 1 |
| 5 JIC anyone wants them all | 0.83 |
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Sixpactogo
Well-Known Member
Not sure what you mean by no comparison between old school and the new Hemi. The 6.1 in my 68 Charger is stock except for a throttle body swap and a diablo tune and it has knocked a high 12 quarter mile at 103 with street tires. IMO, that compares with what the better running street Hemi Chargers were putting down back then.
mmissile
Well-Known Member
It's just such a deceptive package. Power and torque from EFI, roller valvetrain, variable cam timing, and crazy trans ratios in the modern transmissions. When I sat down to plan my `cuda build, the transmission was the most important part to me.
Tomcat
Well-Known Member
Exactly what I'm dreaming of! Lol
6PKRTSE
Well-Known Member
Sure, with enough money, time and effort anything can be done. I am sure your car runs and drives amazing for a 68.
Don't see Top Fuel going to 3rd Gen's anytime soon.
Sixpactogo
Well-Known Member
Absolutely nothing stock on a Top Fueler. I thought we were comparing Old school Hemi's to the Gen 111's.
Obviously you are talking 3000+ HP blown Gen 2 hemi's to your stock 5.7. Thank you for clarifying. You are correct. They do not come close to comparing.
TF Hemis used to run stock intake rockers, maybe still do
if I'm not mistaken
if I'm not mistaken
mmissile
Well-Known Member
11,000 hp
rumblefish360
Well-Known Member
The only 2 complaint’s I have read about a Gen III HEMI swap is the MP oil filter kit not fitting well or actually not at all in the chassis. The other one is the cost of parts and what they totaled for the swap/
If you can get past these two things, IMO, it’s a super grand slam if not a hair better because the vehicles of yesteryear are lighter in weight. This adds to more performance and maybe, just maybe mileage on that long cruise. Your tire size may effect this a little, or, a lot.
If you can get past these two things, IMO, it’s a super grand slam if not a hair better because the vehicles of yesteryear are lighter in weight. This adds to more performance and maybe, just maybe mileage on that long cruise. Your tire size may effect this a little, or, a lot.
rumblefish360
Well-Known Member
On comparing the two engines, it’s not really a fair comparison.
The Gen III is cubic inch & cylinder head limited. Pound for pound is a better comparison. Hp per cube is another good comparison.
The Gen III is cubic inch & cylinder head limited. Pound for pound is a better comparison. Hp per cube is another good comparison.
I'm not super up on new hemis,, but they make a 426 ci no?
Should be easy to compare hp/ cube
rumblefish360
Well-Known Member
You can get or make a 426 Gen III HEMI.
Not really and I already stated why. You took one option away, CID. That’s only a partial. How is that bore and stroke combo made for each? Yes, it does help level the playing field. But the way the bore and stroke combo is will favor one aspect over another. Where do you want that obvious aspect?
So, now we’re down to the cylinder head being limited. Let’s start with the stock cylinder head vs stock cylinder head. The Gen III is valve size limited. How is the port flow between them. Starting again, with just the stock cylinder heads.
Once you go after market, it’s like cheating against the stock part. We will get to upgraded parts later, let’s just start at the base level and work upwards.
The other problem of a comparison between the two is all the modern electronics that the Gen III has. Leave them factory tubes and to the vehicle on which it came in.
Keep the “Hot Rodding” aspect of it out of it all for the moment.
You can only do to one what the other one is capable of in its limitations of the part on hand.
An example is, the Gen III will never take a 2.30 intake valve but the Gen 2 can. The Gen 3 gets the largest valve it can easily take as the Gen 2 can in its stock head without moving the valve over.
rumblefish360
Well-Known Member
This is true.
Just dyno 1 of each, similar cam, unported heads and work from there.
After there's 2 numbers on the table, let the excuses fly in both directions.
After there's 2 numbers on the table, let the excuses fly in both directions.
Sixpactogo
Well-Known Member
Wow! How far off track can we get? This thread started out asking the question How does the Gen III Hemi compare to the vintage engine in terms of daily driver use?
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