Engine RPM, what to expect?
#298099
04/24/09 09:54 AM
04/24/09 09:54 AM
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robchally
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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!
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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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robchally
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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!
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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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5126brl No more
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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.
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Re: Engine RPM, what to expect?
[Re: 383duster]
#298104
04/24/09 12:39 PM
04/24/09 12:39 PM
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robchally
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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!
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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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Posts: 337 the netherlands
383duster
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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!
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Re: Engine RPM, what to expect?
[Re: robchally]
#298107
04/24/09 03:09 PM
04/24/09 03:09 PM
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robchally
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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!
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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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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!
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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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robchally
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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!
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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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robchally
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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!
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Re: Engine RPM, what to expect?
[Re: robchally]
#298114
04/30/09 06:38 PM
04/30/09 06:38 PM
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Joined: Mar 2003
Posts: 337 the netherlands
383duster
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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....
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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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robchally
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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!
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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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Posts: 337 the netherlands
383duster
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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
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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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Posts: 112 the Netherlands
robchally
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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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