340 on dyno video, whats your opinion
- Thread starter duster360
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???
Guess it would help if I posted the link.
dano
Evil Handy Man
Dyno's are subjective. Numbers can be manipulated just in the service of the dyno. Now if they started with a base run then did some changes (heads, cam, headers, intake, tune, carb) you could compare results on that dyno that day. Otherwise it's just a run and it did what it did that day. The track times will tell if it goes to one and is in a sorted car.
We don't know if they're using STD or SAE correction factors either.. You can get very different numbers on the same engine, the same day, just by changing the correction factor.
And, of coarse, they didn't say. maybe this is why they didn't show the top of the page at 9:52 minutes in the video. (where the correction factor would have been listed)
And as Dano aptly stated, better than OEM bolts on's in place..
And, of coarse, they didn't say. maybe this is why they didn't show the top of the page at 9:52 minutes in the video. (where the correction factor would have been listed)
And as Dano aptly stated, better than OEM bolts on's in place..
Beauty of a 64 Polara!
I have regrets that I didn't have my 273 dyno'd. Whatever the outcome it would have been fun.
How stock is this engine? It has mods, but doesn't tell us what they are. Hughes can easily get more HP if you want. This is an unknown engine, no lessons learned here.
Exactly, We know it has a Voodoo cam. Intake looks like a Tarantula may be. The carb is a shop carb I bet. May be a 850? Shop headers as well. Love those dyno videos though.
Still unknown internals but at least with a stock type intake and rusty headers.. This one apparently put out 367 hp.
I'd take it!
I'd take it!
I have been in the dyne room before and expect to be in it again soon. Am restoring a '68 383, but will use roller cam and rockers to survive new oils and gas. The advantage of the dyno is that the motor comes home as a broken-in, running motor, ready to install. The other advantage is that in the future there is no question about the horsepower it produces.
I'll give you the first. Depending on the specifics, it may need more time to be fully run in, but its a still good and any leaks or problems can be addressed.
On the second, eh. We've seen guys here post all sorts of dyno Hp results. You'll have an idea of what it can make, if you can get all the specifics like rate of acceleration, and correction method. I think the real advantage is if you can spend even a bit of time (and money) on tuning the combo; or at minimum at least getting the timing and AFR through the rpms so you have a ballpark starting point.
On the second, eh. We've seen guys here post all sorts of dyno Hp results. You'll have an idea of what it can make, if you can get all the specifics like rate of acceleration, and correction method. I think the real advantage is if you can spend even a bit of time (and money) on tuning the combo; or at minimum at least getting the timing and AFR through the rpms so you have a ballpark starting point.
As far as a stock 340 hp curve, there were two magazine tests done approximately 30 years apart and the results were very similar. Like the tests posted above, there are various unknowns that make it hard to be sure we're comparing apples to apples. Unlike the tests above, we know the 340s tested were built to stock specs and then modifications tested. Some of the gains from modifications done in the more recent article seemed suspiously large...take it for whatever you think its worth.
Mopar Muscle Feb 2001
Hot Rod Magazine August 1969 John Dianna "Mopar Manipulating, Part 1"
Mopar Muscle Feb 2001
Hot Rod Magazine August 1969 John Dianna "Mopar Manipulating, Part 1"
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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The cam peaks at 5400/4000 so probably at least several sizes bigger than stock, so probably the 704Voodoo @234/242/110+4, with some porting work; I'm guessing.
It's not what I would put in a truck, but you can do a lot with gearing.
It could make a pretty good streeter in the right combo, and a great street/stripper. Tons-O-fun
My opinion is take it for what it is worth. After all, it may not turn that much HP on YOUR dyno, maybe more? We are missing a lot of info about the engine but it isn’t really needed.
Also note that while the HP number may seem high, there are missing components to the engine, up front, the parts that not only drag down a few numbers from the dyno run but are kind of necessary to run the engine in your car properly.
WP/PS/Alt. Maybe even AC?
All I see is an engine that has a cam as said and a intake with a Holley up top. I know it’s not a 370hp engine installed and I think this thread just splits hairs on something that is just simply ment to be enjoyed.
If it were myself and you asked how much HP it has I’d just tell you about 320. Then smile.
Also note that while the HP number may seem high, there are missing components to the engine, up front, the parts that not only drag down a few numbers from the dyno run but are kind of necessary to run the engine in your car properly.
WP/PS/Alt. Maybe even AC?
All I see is an engine that has a cam as said and a intake with a Holley up top. I know it’s not a 370hp engine installed and I think this thread just splits hairs on something that is just simply ment to be enjoyed.
If it were myself and you asked how much HP it has I’d just tell you about 320. Then smile.
66Dartdriver
Well-Known Member
i agree take it for what its worth not knowing the internals but those numbers seem right for the 340. Heres my build and dyno numbers. take them for what they are worth but i can tell you My Dart runs like its a 400 hp engine lol. I want to get onto a chassis dyno now and see what it is at the wheels.
The Little 340 that could
The Little 340 that could
I would think it’s a happy dyno, or else they have left out some of the info. Kim
Anybody figure out what type intake? It really doesn't matter much in the numbers. I ran a simple combination on the dyno program and came up with similar results. I even stepped down a cam and used the #703 Voodoo instead of the #704 that AJ mentioned. Small tube headers, High flow dual plane (like a Air Gap), 750 cfm carb, Stock valve size heads with no porting, 9.5/1 compression. Just some generic 340 stuff. 365 hp @ 5000 and 435/tq @ 2500.
Probably a voodoo 268 and that combo is a 340-350hp max combo. Lots of happy numbers especially from a builder that used to be on this site.
Intake is an Air Gap.
Heads didn't look worked over at all from the quick shot. If they had some clean up porting, then 370 is possible. No chance with a factory X/J head is that thing making more than a true, track MPH observed 350hp. My 2 cents and worth less than you paid! LOL
Intake is an Air Gap.
Heads didn't look worked over at all from the quick shot. If they had some clean up porting, then 370 is possible. No chance with a factory X/J head is that thing making more than a true, track MPH observed 350hp. My 2 cents and worth less than you paid! LOL
That's what I like about you Cracked. You lay it on the line. Yep. it sounded good on the dyno and the numbers were good compared to the anemic numbers the factory posted back in the day.I wouldn't mind that mill in either of my A bodies. The 66 would be fun for sure.
The software produces similar happy numbers for the stock cam when the same options are selected. LOL.
Hp peaks early, so its calculating something isn't quite right in the sim.
Hp peaks early, so its calculating something isn't quite right in the sim.
I think I can change the limits for a different graph. No reason my example needs to top out at 9000 rpm. LOL It shows the flat torque curve though.
Thanks Toolman.... some of the numbers are funny like that old Dyno Derby 340 with a XE268H, stock heads popping 390+ hp... sure it does... Not a fricken real world chance it runs anywhere close to those numbers at the track! Maybe with a 50 shot of juice! 
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