Dyno testing a stock(?) 1972 440

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IQ52

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We're doing a dyno exhibition for the locals on Saturday the 14th so they can see what an engine dyno is and what it may be useful for. We pulled a 440 engine from a 1978 New Yorker, that turned out to be a 1972 440, .040" over with 906 heads. Pistons are .160" down from the deck, so with the 906 heads we're in the 7.5:1 compression ratio range.

Changing one thing at a time, headers, carburetor, camshaft and intake manifold, we have increased 22 horsepower at 3000 rpm and 154 HP @ 5500 rpm. We started with the closest thing to the factory 383/440 HP cam that I could find cheap, the Summit Racing SUM-6400, and switched to an old Mopar Performance 509 cam ground on a 108 degree lobe separation.

As we are having the town's people and whoever else may show up, guess the peak horsepower and torque we get with each change as we make them (again), I can't post specific results until after Saturday. Hopefully we can make a head swap to a pair of ported 516 heads we've had laying around and see what difference they will make also.
 
I hope you can make / post a video for those of us that can't be there, LOL
 
I enjoy all the head flow results you share and looking forward to the dyno results.
hope you have the time to test the 516s. thank you
 
Sounds like fun, although that "down-in-the-hole" problem was the first thing that popped into my mind. Don't suppose you'd wanna tear it down to the bare block and send it out for a proper decking wouldjya? :D That would be interesting.
 
I saw where you were going to do the dyno/demo. Very cool, i hope the attendance is good.

Those piston to deck numbers had to even surprise you I would imagine?
 
"Pistons are .160" down from the deck"

"send it out for a proper decking wouldjya?"

I don't think you can deck a block .16" because it would change the deck geometry too much, so IQ52 would have to install new pistons to get a higher c.r.

As always, please correct me if I'm wrong!
 
I would be really interested in the 516 head numbers.
 
I love the scientific method testing.

Too many magazines say "we normally wouldn't do this, but we changed everything at the same time...)(so you don't really know which mod helped the most, or how they affect each other.)

IMO, that's pretty much what they NORMALLY do, so they should just stop saying it.
 
I am curious to see the results. I had a stone stock '73 440 out of a C-body with the factory thermoquad in a '73 Cuda. Got it to run mid 13's.
 
OldmanRick said:
I saw where you were going to do the dyno/demo. Very cool, i hope the attendance is good.

Those piston to deck numbers had to even surprise you I would imagine?
Click to expand...

Actually it was as expected.
 
RustyRatRod said:
I would be really interested in the 516 head numbers.
Click to expand...

You'll get flow numbers and horsepower results.

MRL Performance said:
What FUN! To bad your 2200 miles away or I would be there.
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It would be fun to have you here Mike.

MOPARoldtimer said:
"Pistons are .160" down from the deck"

"send it out for a proper decking wouldjya?"

I don't think you can deck a block .16" because it would change the deck geometry too much, so IQ52 would have to install new pistons to get a higher c.r.

As always, please correct me if I'm wrong!
Click to expand...

No need for correction, you are right.

fishmens67 said:
I enjoy all the head flow results you share and looking forward to the dyno results.
hope you have the time to test the 516s. thank you
Click to expand...

We will be testing the 516 heads. It is one of the reasons to do the dyno demonstration.
 
First pull.

1972 440, .040" over for 448 ci, cast pistons, 7.45:1 compression, cast crankshaft, stock 906 cylinder heads, 1967 600cfm Carter 4bbl, 1972 stock cast iron intake, Summit Racing SUM-6400 camshaft 214/224 @ .050 .444/.446 lift, 112 degree LS, 106 ICL, 1964 stock cast iron exhaust (before you laugh too much, the next pull is with factory HP exhaust manifolds, be ready for a suprise).

RPM...............TQ.................HP

2500.............414................197
2600.............402................199
2700.............403................207
2800.............402................215
2900.............399................220
3000.............403................230
3100.............397................235
3200.............399................243
3300.............399................251
3400.............391................253
3500.............385................257
3600.............380................261
3700.............371................262
3800.............365................264
3900.............358................266
4000.............350................266
4100.............348................271
4200.............336................268
4300.............332................272
4400.............323................271
4500.............313................268
4600.............304................266
4700.............295................264
4800.............283................259
4900.............267................249
5000.............260................248
5100.............249................241
5200.............231................229
5400.............214................220
5500.............204................214

Well, there you have it. A semi-typical motorhome or Chrylser New Yorker 440 from the 1972-1978 era. What can you possibly accomplish with a start like this?
 
I love the low side torque numbers. Not a DAMN thing wrong with those. ;)
 
Right. The best truck engine I've had to date came out of a 1973 Chrysler New Yorker. But, I ain't thinkin' truck here. What does it cost to buy a pair of HP manifolds? Lets put on those High Performance exhaust manifolds and see what happens.

RPM................TQ.................HP

2500..............413................196
2600..............405................200
2700..............398................205
2800..............403................215
2900..............400................221
3000..............402................230
3100..............401................236
3200..............401................244
3300..............401................252
3400..............394................255
3500..............386................257
3600..............386................265
3700..............374................264
3800..............372................269
3900..............360................267
4000..............354................269
4100..............353................276
4200..............344................275
4300..............337................276
4400..............323................270
4500..............310................265
4600..............301................264
4700..............289................258
4800..............274................250
4900..............268................250
5000..............250................238
5100..............249................241
5200..............236................233
5300..............220................222
5400..............210................216
5500..............198................207

We did this test as a personal favor for a friend, who I hope remains a friend after the test! I'm not buying these High Performance manifolds for "high performance".
 
That's quite interesting. Are yall going to try some headers?
 
In general, past 3500 r's they turned to poopoo. Very interesting, and evidently only good for a resto?

You may have to hand out hankie's when you post those results over on the "B" side.....lol.
 
OldmanRick said:
Wonder how a "Dual Energy" grind would work with the HP's?

http://www.summitracing.com/parts/cca-21-406-4/overview/make/Plymouth

I know you're not going there, just threw it out for something to think about for those using them.
Click to expand...

I think cams designed for crappy exhausts would work with any crappy exhaust.

Yeah we're not going THERE, but we'll take you through, step-by-step, how today we got to 473 lb-ft & 449 HP staying UNDER 8:1 compression.

Torque curve is flat as a table top from 3000 rpm to 5500 rpm and never is lower than 421 lb-ft.

It's still making 431 HP at 5800 rpm.

These low compression motors just wont make any horsepower will they?
 
IQ52 said:
I think cams designed for crappy exhausts would work with any crappy exhaust.

Yeah we're not going THERE, but we'll take you through, step-by-step, how today we got to 473 lb-ft & 449 HP staying UNDER 8:1 compression.

Torque curve is flat as a table top from 3000 rpm to 5500 rpm and never is lower than 421 lb-ft.

It's still making 431 HP at 5800 rpm.

These low compression motors just wont make any horsepower will they?
Click to expand...

Very cool! Can't wait to see the details :thumleft:. This rocks!!!
 
Pull # 3.

The change this time was to our dyno headers. These are a short tube 1-3/4 x 1-7/8 x 2" x 3" collector step header. We have a cheap set of longer tube ball connect headers that should make better power on THIS engine, but we didn't have time to make the connection to the dyno exhaust system, so we just went with what we had that worked for dyno day. Time was going to be in short supply, we were going to make seven changes, one at a time, including camshaft and cylinder heads.

RPM.................TQ................HP

2500...............427...............203
2600...............422...............209
2700...............416...............214
2800...............419...............223
2900...............419...............231
3000...............419...............239
3100...............417...............246
3200...............417...............254
3300...............414...............260
3400...............406...............263
3500...............400...............266
3600...............393...............269
3700...............386...............272
3800...............376...............272
3900...............376...............279
4000...............368...............280
4100...............365...............285
4200...............357...............285
4300...............348...............285
4400...............342...............287
4500...............328...............281
4600...............318...............278
4700...............311...............278
4800...............298...............272 +22 HP
4900...............278...............259
5000...............271...............257
5100...............263...............255
5200...............247...............244
5300...............234...............237
5400...............224...............230
5500...............213...............223

Nothing spectacular, but none the less a positive gain through the entire rpm range.
 
So, headers make power. Nuff said. This is cool Jim. Thanks.
 
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