Another intake thread

[OKDart]

You might be interested in this Engine masters episode. They dyno air filters on a 760 hp Chevy engine. The dual snorkel kills 53 hp at that level. Minute mark 9:05, they say it can probably support about 390 hp. But flip the lid and the numbers are: kills 12 hp and supports 640 hp.

 

[gtxrt]

won't lose that much doing what i posted. K&N filter open base and some air coming in the back. you lose the HP at the upper rpms not across the board right ?

 

[WileE]

Please elaborate. Never heard of them.

It's actually F.A.S.T. = Factory Appearance Stock Tire... it's a racing segment aimed at just that. For stock-configured cars that have been modified but limited to stock parts.

 

[1968rt]

CH4B take a look Intake Manifold Engine & RPM Range Test - Induction Extravaganza

 

[WileE]

CH4B take a look Intake Manifold Engine & RPM Range Test - Induction Extravaganza

I recall that article. Interesting because I'd had/used all those manifolds except the Weiand. Which perhaps may suit the OP's premise. I did have a SD with TQ under a stock hood, but not a 73-74, and not with a snorkel air cleaner.

 

[gtxrt]

that article has been out for years. I used the weiand not much higher than stock and no bigger runners and not any better on my gtx years ago and also a performer intake with Hughes ported heads. talked with Dave at Hughes engines he said put a rpm performer on and pick up 30 HP and I did it picked up 3 tenths.the ch4b has a bigger plenum and a little bigger runners on my Newport it loss a little bottom end and picked up a little power over 4500 rpms but the car never went faster. I shifted at 5200-5300 rpms. I asked Dave what was going on with the rpm performer he said one thing it was taller which helped a lot to make power. the Holley SD would be alright on a race car with gears and a converter to get to 3500 rpms to start making power.

 

[gtxrt]

talking less than 1 mph. same as I feel about the 440 intakes

 

[BSB67]

The problem with that 383 testing is that the intake was not the limiting factor. You’re not going to learn much from testing intakes on a 300 hp motor. Put those intakes on a 450 hp engine with a big enough carb and you’ll see considerable separation.

Without controlling a pile of track variables and correcting to standard conditions, you cannot conclude much from that testing, other than at that power level, the intake doesn’t matter much.

 

[gtxrt]

my testing on my Newport high 13's was about 400HP and 500TQ no port work with 1.6 exhaust valve, no headers and 2.94 gears with 5 different intakes, stock, ported stock, the performer, the ch4b and the winner the performer rpm. my gtx was low 12's not sure on HP but with ported Hughes heads, 800 cfm carb, 3.23 gears and headers the performer rpm picked up 3 tenths and 3 mph over the performer and the weiand intakes. that is all I need to know. case closed with me. knock yourself out buying and taking intakes on and off.

 

[gtxrt]

testing intakes on a 300 hp motor.

must be more than 300 HP to go 14 seconds and 100 mph with a roadrunner. stock roadrunners were around 15.5 seconds 1/4 mile times.

 

[RR Fan Dan]

CH4B take a look Intake Manifold Engine & RPM Range Test - Induction Extravaganza

That’s the article but it used to have a chart at the end comparing them all. It doesn’t say what the gains were from each one. And the iron intake they used is not the premium one I have.

 

[WileE]

That’s the article but it used to have a chart at the end comparing them all. It doesn’t say what the gains were from each one. And the iron intake they used is not the premium one I have.

What is "the premium one" ?

 

[RR Fan Dan]

What is "the premium one" ?

Post #1.

 

[BSB67]

must be more than 300 HP to go 14 seconds and 100 mph

Agreed. Your car ran very very well.

 

[gtxrt]

I recently swapped out the Torker 2 for a 71 Mopar oem manifold to allow the dual snorkel air cleaner to fit

so what was the difference when you went to the 71 intake from the Torker. lost top end power ? better throttle response ?

 

[BSB67]

my testing on my Newport high 13's was about 400HP and 500TQ no port work with 1.6 exhaust valve, no headers and 2.94 gears with 5 different intakes, stock, ported stock, the performer, the ch4b and the winner the performer rpm. my gtx was low 12's not sure on HP but with ported Hughes heads, 800 cfm carb, 3.23 gears and headers the performer rpm picked up 3 tenths and 3 mph over the performer and the weiand intakes. that is all I need to know. case closed with me. knock yourself out buying and taking intakes on and off.

The restrictive heads and presumed relatively small cam were the restrictions on the posted 383 testing. Maybe the same for your Newport.

The low 12 second GTX being 3 mph better with the RPM over the Performer makes perfect sense. I'm not questioning the advantage of the RPM. If it was a street car w/ street tires & suspension, it was probably trapping at 113-114 mph and in the 475-500 hp range. That would be 110 mph with the Performer. Actually better than I would guess. Do you think the factory intake would go 110? I've track run the factory intake on both modified 440s and 383s. It's hard to get them to trap over 103 mph, which is about 375 hp. They hit a wall and other improvements show diminising returns.

Why does it matter in the context of this thread? The OP has hood clearance issues and and cannot figure out how to make the air cleaner work with any tall intake. So with that my position is simply that he can use either the Performer, or CH4B, and turn his 600 hp motor into a 475-500 hp engine instead of a 400-425 hp engine.

Maybe I'm all wrong. I've been thinking about doing intake testing myself for several years. Maybe next year now that I have the X, as it's probably the better candidate than the Charger for typical hopped up 440s. Although the Charger would be better demonstration for a higher hp application, closer to the OP plan.

 

[gtxrt]

So with that my position is simply that he can use either the Performer, or CH4B, and turn his 600 hp motor into a 475-500 hp engine instead of a 400-425 hp engine.

trying to understand. let's say on my 400 HP Newport the ch4b and the performer didn't help why would they help a 500 HP engine ? and if there was no restriction from the performer and ch4b on 400 HP why did the rpm performer help ? even the stock ported intake helped 15 HP over the ch4b and performer and the rpm performer helped another 15 HP over 4000-4500 rpms.

 

[RT68440]

I was in this same boat recently. I had the 440 rebuilt for the Charger. I didn't get crazy with things because it's the original engine but it's making 530hp/540tq. I'm running Stealth heads that I had ported because I want the correct look. I'm doing a Day 2 vibe with the car, so I had my TTI headers ceramic coated white, I have an 850 Holley Classic carb that's gold, etc. My big debate was the intake manifold. I know that the easy decision would be an Edelbrock RPM, but for one, it wouldn't have the look I was after and two, I'm running my stock air cleaner, no question about it. I know that the higher rise intakes with a stock air cleaner under a flat hood with an RB motor will be tight, plus having to change the kick down linkage bracket, etc. So I elected to go with a CH4B manifold. It's correct for the era and will still allow me to run the stock air cleaner. The engine builder and head porter both told me that I'm leaving about 30 hp on the table by not using the RPM, but the look is more important to me. I did send my CH4B to Bill Diccio who is a FAST racer and does the crazy stock intake porting for the FAST guys, just to get some of that power back, but it still won't complete with the high rise intakes, which I'm willing to make that sacrifice.

 

[gtxrt]

no way the Weiand helped HP at 6300 rpms it is only about as high as a stock intake with small runners. Hot Rod must be getting paid to say that or the Weiand was ported like hell makes no sense to me.

 

[gtxrt]

I did send my CH4B to Bill Diccio who is a FAST racer and does the crazy stock intake porting for the FAST guys, just to get some of that power back

I would guess the porting helped 15 HP on the ch4b plus an alum intake is a lot easier to port than a stock iron intake.