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Author Topic:   another cam q
Dubz
Gearhead

Posts: 243
From: Manitoba Canada
Registered: Oct 2002

posted 02-07-2003 01:54 AM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
comp cams labels their cams as having an operating range, is this the only range they work in, or they are just the most efficient in this range

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1974 Gran Torino, 351W

Just a young buck

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D&S Induction Systems
Gearhead

Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003

posted 02-07-2003 02:35 AM     Click Here to See the Profile for D&S Induction Systems   Click Here to Email D&S Induction Systems     Edit/Delete Message   Reply w/Quote
Lets say you had a cam with an "operating range" of 2500-6500. And you also had the ideal heads and intake etc. to match it.

Put the engine on the pump and you would find the engine make more HP per RPM with in 2500 to 6500 rpm range.

I dont know these guys but, here is a dyno sheet I found on the net.

From the looks of it this engine has a cam with an "rpm range" from about 4200 to 6000.

There is alot more to the big picture and I know I didn't explane it all that well but it's the best I could do in a forum.

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Fastymz
Moderator

Posts: 9095
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 02-07-2003 12:18 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
So you pick the range the motor will in most the time.And find the cam that matches that range?

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oddly obsessed with big scoops on little Mustangs

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65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

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Dubz
Gearhead

Posts: 243
From: Manitoba Canada
Registered: Oct 2002

posted 02-07-2003 01:35 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
so i pick a cam i'd want for cruising, and then i can still give her hell and get the rpms up there....

allright, that's all i was asking

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D&S Induction Systems
Gearhead

Posts: 118
From: Columbia Heights Mn U.S.A.
Registered: Feb 2003

posted 02-07-2003 07:07 PM     Click Here to See the Profile for D&S Induction Systems   Click Here to Email D&S Induction Systems     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fastymz:
So you pick the range the motor will in most the time.And find the cam that matches that range?



Yes, thats one way of looking at it. See, dirt track, and NASCAR engine builders have a harder time finding the correct cam to use than drag race and truck pull engine builders.

In a drag race you may launch at 3000 rpm's and shift at 6200 rpm's. You're not going to be slowing down to 4500 then up to 7000 down to 6100 then to 7150 and so on.

Another example: We just got through doing a 302 stroker (347) for a close freind of mine. This thing pulls HARD! from about 3800 to 7500. We used TF heads and comp cams 305H.
Now he wants to street this thing (wich is fine) but the thing goes through ALOT of gas and the rpm's are always 2800+. Any lower than that and the engine is going "lumpity lump" shaking the car to all over. It's a stick wich makes it even worse.

We could have stuck a smaller cam in with less overlap (wich would help the idle) but at the cost of top end power. It's all a trade off.

As far as "streeting" high rpm engines... It's all in the owner.

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Dubz
Gearhead

Posts: 243
From: Manitoba Canada
Registered: Oct 2002

posted 02-07-2003 07:13 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
so the range is then the "happy range" for the cam, not the limits of operation

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Toronado3800
Gearhead

Posts: 191
From: St. Louis, MO
Registered: Jul 2001

posted 02-07-2003 10:53 PM     Click Here to See the Profile for Toronado3800     Edit/Delete Message   Reply w/Quote
Yeah, it won't just turn off at 6501 RPMs or nothing, it just isn't as efficient. D&S is right on the money for making your parts match.

First time I bought a cam I spent hours looking at Jegs and Summits charts to see who claimed what RPM ranges.

What all parts do you'all consider RPM performance sensitive? Like Torque Converters have a guestimated stall, heads have an RPM band, Intakes...exhaust, in a way.

Dubz, what kinda 351W you trying to build?

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Dubz
Gearhead

Posts: 243
From: Manitoba Canada
Registered: Oct 2002

posted 02-08-2003 03:21 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
a nice lively street strip car, will get driven fairly often on the street, but will also see track use fairly often. A 1300 - 6800 rpm range, if possible. My car will be a pro-street when it is all done, so it need to have some decent power, and be able to rev nice and high

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1974 Gran Torino, 351W

Just a young buck My Page

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