ZZ502 DUD questions
#62
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Originally Posted by Pat McPherson
Yup you're right, stamped rockers, and 850cfm carb...
GM rates the ZZ502 502HP @ 5200rpm.
I checked Hot Rod magazine for a Dyno test. The only one I could find was a ZZ502 with an after-market fuel injection system. The tests showed between 508 and 528HP at 5400rpm.
So ROTAX, are you saying that Firewalker should be seeing more out of his ZZ502 stock?
GM rates the ZZ502 502HP @ 5200rpm.
I checked Hot Rod magazine for a Dyno test. The only one I could find was a ZZ502 with an after-market fuel injection system. The tests showed between 508 and 528HP at 5400rpm.
So ROTAX, are you saying that Firewalker should be seeing more out of his ZZ502 stock?
#63
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Originally Posted by Firewalker
Mine came without the carb or ignition.
I would also think that every dyno is different. I will get a HP 500 chart from them also to see the difference.
RT
Do any of you think it would be worth changing the SS exhaust valves to Inconel?, and the head gaskets while that is being done?
RT
I would also think that every dyno is different. I will get a HP 500 chart from them also to see the difference.
RT
Do any of you think it would be worth changing the SS exhaust valves to Inconel?, and the head gaskets while that is being done?
RT
#64
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Just talked to the engine builder doing Firewalkers piece. Called him to tell him his new customized ball bearinged marine distributor is ready and he told me they just dynoed the zz502 after sorting it out. 562hp at 5400, 578 lbft. That should wake the little panchanga up some over the old 330 hp
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#65
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Yup, I have the DYNO sheet infront of me.
holds over 550 ft/lb from 3500 to 5300.
That is with a Cam change and Victor Jr. intake, still on the 800 cfm carb.
Makes about 45 more than an HP 500 carb apparentyl.
Yup the P-22 should RIP!.
RT
holds over 550 ft/lb from 3500 to 5300.
That is with a Cam change and Victor Jr. intake, still on the 800 cfm carb.
Makes about 45 more than an HP 500 carb apparentyl.
Yup the P-22 should RIP!.
RT
#68
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Hmmmm...My 23 Nova ran +,- 57 gps with a 7.4/330. With the ZZ502/502 dropped in, 70 gps is pretty common, 69 any time and up to an all time top end of 73.1, on a cool dry day.
I'd guess your speed will be somewhere between thrilling and scary![Big Grin](/forums/images/smilies/biggrin.gif)
Be sure to check your steering out REAL WELL before lighting the fuse on that rocket.
I'd guess your speed will be somewhere between thrilling and scary
![Big Grin](/forums/images/smilies/biggrin.gif)
Be sure to check your steering out REAL WELL before lighting the fuse on that rocket.