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Old 10-20-2001, 00:38   #1 (permalink)
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Question 302/347 Camshafts

Well, some of you may recall my engine has been rebuilt a few times already. In that time I have seen a couple of cams and head combos and not all have been okay.

Here's my predicament:
After the first build (which I was way happy with) the compression was reduced and a BIG cam was put in. The bottom end died in the arse and it idled rough (and pigrooted majorly in low speed driving) but in fanging around with Laminge in Melbourne it didn't go too bad :D at all up higher in the rev range. Prob was it was a ***** in traffic.

Then the 220 cam was put back in but it dies in the arse up high now (above 4-4500rpm). A result of the lower compression perhaps?

So, after crunching a spreadsheet with some different camshaft specs I now find that the 220 cam seems a bit short in the intake side duration and isn't all that crash hot on lift (less than 0.500).

Has anyone got any input and experience in camshaft specs for the 302/347 XR8 spec engines? I was just after some independent thinking as I think I have found a good compromise cam. Must be driveable with a 5 speed and still have good mid range power.

SPECIAL NOTE TO LAMINGE:
Have you got the specs for your cam? Just wanted them for my spreadsheet as it was the same cam I had before.
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Old 10-20-2001, 02:13   #2 (permalink)
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Have you tried a custom grind? Might be the only way to go now.
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Old 10-20-2001, 03:41   #3 (permalink)
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I have an E303 in mine without any real dramas.... Pulls to redline without dropping off, from say 2000rpm onwards things start to wizz by at a scary rate
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Old 10-20-2001, 04:13   #4 (permalink)
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When i do my stroker, i was just going to use the E303 cam.

220/282 intake
220/282 exhaust
.498" lift

Thats the exact same spec as one the crane cames availble here.
I think the E303 spec is a good cam because there's 0 overlap and has been a prooven performer in the states.
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Old 10-20-2001, 22:06   #5 (permalink)
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Yeah, I was thinking either E303 or F303. How does the car idle on the E303? What comp ratio are you running with it?
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Old 10-21-2001, 00:45   #6 (permalink)
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A lovely rumbly note when at idle, never really lopey i guess very crisp comp ratio is at 9.8:1 how can i tape an exhaust note & plug it in here ??? any takers
Cheers
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Old 10-21-2001, 03:07   #7 (permalink)
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Quote:
Originally posted by svo302
A lovely rumbly note when at idle, never really lopey i guess very crisp comp ratio is at 9.8:1 how can i tape an exhaust note & plug it in here ??? any takers
Cheers
You could try what I did.. a bit dodgy but worked!! :D Set up the computer close to the garage. Run a microphone from the soundcard to near the exhaust, and using simple sound recording software you can capture to .wav file. From there, you could compress it into mp3 to save space. Not quite the same as recording it in full flight on the road, which I haven't been able to do yet with mine :(
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Old 10-21-2001, 18:39   #8 (permalink)
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I have a Crane Cam Compu Cam 2031.

although there doesnt seem to be too much power below 2grand, its not like there is nothing there..

as soon as the car goes over about 2500 it only takes a second before I red line.

CobraXR actually made the needle on the tacho go past 6000 and hit the bottom of the dash!!

http://dab7.cranecams.com/SpecCard/D...1=Display+Card
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Old 10-21-2001, 23:11   #9 (permalink)
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What is your complete combo Aussie Pete?

Pete.
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Old 10-21-2001, 23:15   #10 (permalink)
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Quote:
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What is your complete combo Aussie Pete?

Pete.
347, GT40P ported heads at 9.5 compression. All else is standard XR8 220 stuff.
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