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Old 12-03-2003, 01:45   #1 (permalink)
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power

I dont know how to ask this question so here I go.....

Who's engine makes power after the sugested rpm range of their cam has finished?

My cam has a range of 2500-6500 but its peak is before 6500,due to the small carbs(webers) i have on it at the moment.

I am trying to work out if a four barrel will give me the extra flow at the top end I need to take full advantage of my cam and heads
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Old 12-03-2003, 02:12   #2 (permalink)
Two SC 61's = trouble
 
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Re: power

Mate the total flow of those Webbers will out flow any 4 barrel imo for street use anyway...Imo..
Can the chokes/ venturies be sized bigger???
What the flo numbers from your heads?? What type??
Was cam installed straight up ???
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Old 12-03-2003, 02:36   #3 (permalink)
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Re: power

Its common. A flat tappet cam has a powerband of 3,000rpm. Most manufacturers stretch the powerband a bit to make things look a little bit better, so if the advertised powerband is greater than 3,000, ask some questions...

Also in the case of 302/351 cams, they shouldn't really be in the came group. The same cam in a 351 will appear smaller than in a 302 and will peak earlier.



What are the exact specs of your cam?
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Old 12-03-2003, 12:32   #4 (permalink)
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Re: power

The heads are alloy windsor snr's

Intake cfm Exhaust cfm
67.2@0.100 57.8@0.100
139.4@0.200 117.2@0.200
197.9@0.300 151.9@0.300
243.4@0.400 185.6@0.400
275.1@0.500 193.7@0.500
298.1@0.600 203.2@0.600
309.2@0.700 209.2@0.700

Cam is by Comp cams,solid flat tappet
294's, 560lift, 248 @.050, 110 lobes, 294adv duration

Cam straight up.

Need chokes on the street.

Venturies cannot be up sized........its 48's thats required.

EBXR8240 ,I have a theory/belief about flow of my webers compared to four barrels which I will explain when i get some more time,but if you could explain how you think that 44mm webers(250cfm each venturi) would give me more top end flow that a 750cfm four barrel I am open to any info you could give me.
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Old 12-03-2003, 15:25   #5 (permalink)
Two SC 61's = trouble
 
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Re: power

If the Webbers are like side droughts the choke or better named ventury can be changed.
But if each ventury flows 250cfm thats 2000cfm over all 8...That cam being a lob seperation of 110* will have strong power then fall off quicker than say 112*....
Webbers are better metering as well imo especially on small-ish engines...I assume valve springs are up to lift & rev range ???
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Old 12-03-2003, 16:11   #6 (permalink)
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Re: power

Quote:
Originally Posted by 347
The heads are alloy windsor snr's

Intake cfm Exhaust cfm
67.2@0.100 57.8@0.100
139.4@0.200 117.2@0.200
197.9@0.300 151.9@0.300
243.4@0.400 185.6@0.400
275.1@0.500 193.7@0.500
298.1@0.600 203.2@0.600
309.2@0.700 209.2@0.700

Cam is by Comp cams,solid flat tappet
294's, 560lift, 248 @.050, 110 lobes, 294adv duration

Cam straight up.

Need chokes on the street.

Venturies cannot be up sized........its 48's thats required.

EBXR8240 ,I have a theory/belief about flow of my webers compared to four barrels which I will explain when i get some more time,but if you could explain how you think that 44mm webers(250cfm each venturi) would give me more top end flow that a 750cfm four barrel I am open to any info you could give me.
Head flow is meaningless without port volumes. From memory windsor seniors are 200cc "before" the porting begins. I'd say your heads are probably 210-215cc by now. My AFR's flow almost the same but at only 185cc. More efficient and higher port velocitiy.

A 248@50 is a whopping great cam. I would expect it to make peak power in the high 6,000's in a 302, or mid 6's in a 347.

I'm curious to know. How does your cam idle and how much vacuum does it have at idle?
I used to use a 238@50 in it only pulled 4 inches of vacum in a 306

Last edited by Racer; 12-03-2003 at 16:15.
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Old 12-03-2003, 17:20   #7 (permalink)
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Re: power

Quote:
Originally Posted by Racer
Also in the case of 302/351 cams, they shouldn't really be in the came group. The same cam in a 351 will appear smaller than in a 302 and will peak earlier.
That's exactly right! The advertised rev range would be for a 302 windsor, and since he has what one would assume is a 347 stroker it has to peak lower.
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Old 12-03-2003, 20:28   #8 (permalink)
Two SC 61's = trouble
 
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Re: power

Racer.. Imo those Webbers would work on VERY low vac.They work more on pulses than vacuum.

Search here or try this..

http://www.corral.net
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Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...

Last edited by ebxr8240; 12-03-2003 at 20:52.
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Old 12-04-2003, 00:58   #9 (permalink)
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Re: power

As for vacuum i have no idea.......idle is 900rpm ,can cruise around in 4th at 60kph no problems,no bunny hopping, no nead to gear down because the cam is "too lumpy"
Webers really smooth out a cam..i think EBXR8240 would have heard it idle..?
I dont think it has a rough idle...what about you EBXR??

My engine may have"2000"cfm but that is a combined total

Each piston only gets 250cfm air/fuel at full throttle, A four inch piston doing 6500rpm being fed by 250cfm ,I believe would be starving for air/fuel in the upper rpm range

But what if each piston had the availability of 750cfm,Does anybody agree that the upper rpms could produce more power with the availability of 3 times as much air/fuel if required?
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Old 12-04-2003, 01:59   #10 (permalink)
Two SC 61's = trouble
 
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Re: power

Yes I'v heard it and it sounds bloody great !! Gone in sixty seconds sound..

I still think going 750 is going backwards, remember it still needs to feed the other 7 cylinders.Pluss like efi being one inlet per cylinder you get better ram effect. I think some trumpets on those carbs may help also. From what I saw they where open..Some kind of induction to get clean cool air[filtered] will help also...I have been in a 347 Cobra that had a Comp cams XE 282 cam, they are specially for strokers apparently....Whats the vacuum at wot ?? Too much vac then theyr too small??
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Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...

Last edited by ebxr8240; 12-04-2003 at 02:06.
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