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Engine RPM, what to expect? #298099
04/24/09 09:54 AM
04/24/09 09:54 AM
Joined: May 2003
Posts: 112
the Netherlands
robchally Offline OP
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In the process of restoring our 72 challenger, we're on the point of choosing rear axle components.

We did not run our 493 engine yet, but we need an estimate on the max rpm.
All new parts, specs:
493 cui, 10.88 compression ratio
edelbrock performer heads, 88 cc
edelbrock performer rpm intake
Speed demon 850
Comp cams XE275
2" tti headers

There must be someone already running this combo!!! Thanks!


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298100
04/24/09 10:20 AM
04/24/09 10:20 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
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I don't see an XE275. Is this the cam? XE274H-10, 274/286 - .488/.491, if so it's range is 1800-6k so I'd guess you want to be able to take it to 6200 if need be. 3.73's or 3.91's would be a good choice. With the standrad 275/60/15


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: Engine RPM, what to expect? [Re: Mr.Yuck] #298101
04/24/09 11:15 AM
04/24/09 11:15 AM
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the Netherlands
robchally Offline OP
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It's this cam:

Duration at .050" lift: 230/236 (int/exh)
Valve lift with 1.5 rockers: .488"/.491" (int/exh)
Single bolt, high performance street, very strong mid-range, 2200+ stall converter.
Comp Cams 21-224-4

Given 6000 rpm, but what's to expect?
We're in doubt of 3.55 or 3.91. I lean to 3.91


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298102
04/24/09 11:53 AM
04/24/09 11:53 AM
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Connecticut
5126brl No more Offline
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Peak power 5800 rpm
Go with the 3.55's you have plenty of Tq.

Last edited by 4406brl; 04/24/09 11:56 AM.
Re: Engine RPM, what to expect? [Re: 5126brl No more] #298103
04/24/09 12:07 PM
04/24/09 12:07 PM
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the netherlands
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383duster Offline
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Go with 3.55 Rob, you will drive on the street for 95% so it makes no sense to go with a shorter gear, and you will make torque enough to light them up anyway

Last edited by 383duster; 04/24/09 12:07 PM.
Re: Engine RPM, what to expect? [Re: 383duster] #298104
04/24/09 12:39 PM
04/24/09 12:39 PM
Joined: May 2003
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the Netherlands
robchally Offline OP
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Hey, Martijn, is that you?

Too bad the Belgian guy did not purchase that dyno. Than we would have known for sure!!

I made another bet with my son to run 11.99999999. He thinks we'll run 12.5 or higher. I'm now concentrating to reach that 11.9999 and I'm ready to compromise a bit towards strip set-up for street use..


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298105
04/24/09 01:47 PM
04/24/09 01:47 PM
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the netherlands
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383duster Offline
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Quote:

Hey, Martijn, is that you?

I made another bet with my son to run 11.99999999. He thinks we'll run 12.5 or higher. I'm now concentrating to reach that 11.9999 and I'm ready to compromise a bit towards strip set-up for street use..




Yes it is me!

The cam you got with the Eddy's and 496 cubes is gonna give you a lot of torque and is not build as a RPM screamer so I think that with the 3.55's you will go pretty good with the torque you got.

In my opinion you don't have to make high revs to get youre engine alive, you got torque in the lower revs!

Re: Engine RPM, what to expect? [Re: 383duster] #298106
04/24/09 01:55 PM
04/24/09 01:55 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
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the car will run 3-4 thenths faster w/ 3.91's. I'll put a $20 bill on it.

Re: Engine RPM, what to expect? [Re: robchally] #298107
04/24/09 03:09 PM
04/24/09 03:09 PM
Joined: May 2003
Posts: 112
the Netherlands
robchally Offline OP
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383duster/Martijn,

You built my transmission. In your honest and professional opinion, do you think my tranny will be able to handle 11.99999? If you think it will, I'll go for it and choose 3.91, because I need every thenth. If you think it will not, I'll choose 3.55 and will not run on slicks to reach the goal!


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298108
04/24/09 07:59 PM
04/24/09 07:59 PM
Joined: Nov 2006
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oklahoma
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forphorty Offline
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oklahoma
My vote would be for the 3.55s. You should EASILY be able to run 11.99 with what you have. Expect it to be faster than that , traction permitting of course. Cam is a bit small for a 493, should be a torque monster tho.

Re: Engine RPM, what to expect? [Re: robchally] #298109
04/24/09 11:57 PM
04/24/09 11:57 PM
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land of 10,000______'s
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BDS871Cuda Offline
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Quote:

It's this cam:

Duration at .050" lift: 230/236 (int/exh)
Valve lift with 1.5 rockers: .488"/.491" (int/exh)
Single bolt, high performance street, very strong mid-range, 2200+ stall converter.
Comp Cams 21-224-4

Given 6000 rpm, but what's to expect?
We're in doubt of 3.55 or 3.91. I lean to 3.91




That is a tiny cam for a 493 CI motor.
I don't see alot of power past 5700 rpm.
The 3.55's or the 3.91's will depend on tire size.
A 28" or 29" would be good with a 3.91 and anything
smaller and I would go 3.55's.
Your motor will be a TQ motor, not a high rev
HP motor.

11.99? shouldn't be that hard, even with that
little cam.


Snap your neck, mega G-force launch, is all I want!
Re: Engine RPM, what to expect? [Re: BDS871Cuda] #298110
04/25/09 02:35 AM
04/25/09 02:35 AM
Joined: Feb 2003
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Manitoba, Canada
DaytonaTurbo Offline
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That cam would do 6k tops and make peak power at near 5500 in a 440. Up that to 500 cubes and that cam is gonna make that engine a real torker. If it was a 440 I would suggest 3.91's, but I think since you're not going to be able to rev that engine terribly high to get power out of it, you would be better off with the 3.55's.

Re: Engine RPM, what to expect? [Re: DaytonaTurbo] #298111
04/25/09 06:11 AM
04/25/09 06:11 AM
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Nelson-New Zealand
BIG-MIKE-500 ci Offline
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Hi there Rob, Mike in New Zealand here.
I have an Australian Charger with a 493ci stroker.
The car weighs in at a little over 4000 lbs with me & a tank of gas.
I run a New-Process 4-speed & Ford 9" out back.
It has 2:75 gears;Yes,2:75; & it does a 60ft of 1:92-2:00 secs & the 1/4 is always around 12:15-12:25@117-118:50mph.
Now the combo is 440 Source Stealth Heads(no slower than Hughes Engines stage 2 Iron Heads;had them on before). Comp Cams 294 Solid(248@050");Weiend Xcelerator Single Plane;10:00 comp: which gives 193 lbs cranking pressure installed straight-up; 1-7/8th Headers & 850 D/P for the Drags. I just swap it over for a 650 D/P for on the street.
This combo gives me 17 miles per gallon imperial(about 19 US per gallon).
I would think hard about using that cam as your cylinder pressure will be through the roof.
Even the 294 is like a duration of 257 in a 440.
Be sure that you want it that small.
Mine pulls real hard from 2600-5800rpm.
It will do 6800 if I hold the gear, but feels best shifting at around 6000.
I just use ordinary Pump Premium.
I am a bloody hard driver & seem to get away with using all this grunt for accelorating all the time.
That mpg is for around 80-90 mph driving.
I use to go more like 70-130 mph all the time till about 10 years ago; now they would chuck me in jail.([Edited by Moparts - Keep it clean]!)
This is just awesome to drive & I use a Gold Center Force Clutch.
If you are Auto, I would suggest 2800-3000 stall
& go with the tall gears. On the street you will be real happy, & fer the sake of a few 10ths at the drags, you will save [Edited by Moparts - Keep it clean]-loads of gas.
Regards, Mike.

Re: Engine RPM, what to expect? [Re: robchally] #298112
04/25/09 07:31 AM
04/25/09 07:31 AM
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the Netherlands
robchally Offline OP
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I am aware that the cam keeps the performance down. We had a long think about it. My son wanted a big cam, I wanted to stay alive on the road.
We had 300 HP in a B body before, now we're looking at 500+ HP in an E body with a lot of bite. We decided to go with the little cam for a while.
My engine builder in Belgium planned to build a dyno-room. Due to the recession he decided to not go with that, too bad.
We plan to have the car running in about 18 months, so we still have some time for the final set-up choises. But after this summer we will finish the rear. Because we go on a camper trip to the states, end of june, (east of the rocky mountains), we might take some parts from dollar country to europe!

Thanks guys, for all the effort!
Have one from me!


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: BIG-MIKE-500 ci] #298113
04/25/09 07:38 AM
04/25/09 07:38 AM
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the Netherlands
robchally Offline OP
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Ow, and Bigmike500,
I don't understand too much about cams, but I will check your remark about cilinderpressure with the engine builder; They are really experienced mopar-only specialists. Well known on street, strip and tractor-pullers.

This might be my final touch to go with a dyno run on the engine after all!

Thnks.


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298114
04/30/09 06:38 PM
04/30/09 06:38 PM
Joined: Mar 2003
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the netherlands
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383duster Offline
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Quote:


I don't understand too much about cams, but I will check your remark about cilinderpressure with the engine builder

Thnks.




I don't understand too much about cams, but I will check your remark about cilinderpressure with the engine builder

Thnks.




I'm not youre engine builder but will give my opinion as well.

You know my car and engine, you and your son even went for a spin with me

The CR you got is about the same as me (mine is 10:5 calculated) and I got the 284XE cam in it (240/246 duration @ .050). But I got 449ci and you 493ci

My cilinderpressure is around 180/185 PSI, measured with hot engine.

With your bigger engine and smaller cam I think your cilinderpressure wil be towards 200PSI.
In my opinion is that not what you want because I can just run on the best pumpgas we got here, I think youre going to have problems with running on pumpgas here in holland....

Re: Engine RPM, what to expect? [Re: 383duster] #298115
05/01/09 05:43 AM
05/01/09 05:43 AM
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the Netherlands
robchally Offline OP
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Ok, thanks 383duster.



My son wanted to go for a bigger cam right from the start. He didn't know why, but now he seems to be right, as often before. Only 16 years of age, it looks like he's got some kind of god-given talent....

I know what to do before installing the engine.

383duster: how about the tranny: 12 second-suitable?


72 challenger in resto. 493 super-engine!
Re: Engine RPM, what to expect? [Re: robchally] #298116
05/01/09 05:36 PM
05/01/09 05:36 PM
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the netherlands
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383duster Offline
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Quote:

Ok, thanks 383duster.



My son wanted to go for a bigger cam right from the start. He didn't know why, but now he seems to be right, as often before. Only 16 years of age, it looks like he's got some kind of god-given talent....

I know what to do before installing the engine.




A bigger cam would make youre engine better for running on our pumpgas, more then 180PSI cranking compression is a problem with pumpgas here. If you use the same cam as me you are at the limit (I am) but you can have one step bigger and still be able to run nice while running traffic because you got a bigger engine.

Quote:

383duster: how about the tranny: 12 second-suitable?




The tranny will not be a problem

Re: Engine RPM, what to expect? [Re: 383duster] #298117
05/02/09 07:49 AM
05/02/09 07:49 AM
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the Netherlands
robchally Offline OP
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Yeah!!

That's the best news for my project for quite some time.
Now we can make final decissions about the rear.

And in time we will re-negotiate the cam. A bigger cam will definately take us over 500 hp, which we need for our 11.9999-goal!!

We now have to be carefull and wait out the financial-crisis a bit.... But step-by-step we're progressing!

Thanks Martijn!!


72 challenger in resto. 493 super-engine!






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