Technical Help needed, Not for the weak at heart

ironman_gq

the valve can stay open beyond bdc because of the ram effect of the air in the manifold pushing a pressure wave down the intake runner forcing more air into the cylinder even as the piston begins its upstroke. the same goes for scavanging on the exhaust side of things.

fuzz401

my cam
not a lot of lift but a lot of duration and over lap

fifesjeep

Fuzz Do you have specs on your cam... I can't view pictures from this computer either... gov control. :(: I was told to look into the CompCams 292H for this build and set the cam 2* advance... what do you think about that? I think the specs for this cam are as follows 244/244 duration @ .050" and .514/.514" lift... I want to say the lobe separation is 110* not sure though... Do you think it would be better going with a dual grind or something that is listed above? I'd like to use a solid cam/lift but my buddy said probably not a good choice if I will drive this from time to time on the road... What are your thoughts with that? I'm basically going to run this piss out of it while I am driving it... I like my heavy foot and the after pucker face moments... I think the 68 olds 442 ingrained that into my sole... "mashed the gas doing about 50 and the ass end swung around" ever since then it's been about power... then again that was a big block... but the sounds of a small block screaming are just as inviting as a big block rumpling.

fuzz401

crower solid cam 292 fdp #45316 intake dur 292 lift .500 exhaust dur 298 lift .510 duration @ .050 intake 246 exhaust 250 intake lift .313 exhaust lift .320 LC at intake center 104 deg

fifesjeep

fuzz401 wrote
crower solid cam 292 fdp #45316

intake dur 292 lift .500
exhaust dur 298 lift .510

duration @ .050
intake 246
exhaust 250
intake lift .313
exhaust lift .320

LC at intake center 104 deg

How choppy does your engine sound? How many degrees did you set your cam at?

AMX69PHATTY

64cc AMC heads Valve Seats - Hardened or Not AMC head Flow numbers Flow - Rocker Ratio - Valve Head Size - Lift - Duration - LCA - LCL All this is over my head :oops: There are post on here somehwere about flow numbers though. Don't have hardened seats in the '70 heads on my motor.

fuzz401

not to choppy I put it in stright up

fifesjeep

I was reading that with milling the heads to 52cc will restrict a lot of flow and a lot of de-shrouding/bowl blending will have to be done is this correct? If so, would you guys recommend milling the block, shaving the pistons to -8cc vice -16cc... have them poke out .008" from the hole... and order a couple of .025" head gaskets... What do you guys think about that?

fifesjeep

Re-did some figures and decided to mill block so that the piston pokes out +.008" I am staying with the .045" Head gaskets... Heads are getting Shaved down to 52cc and then the 2.08" int and 1.74" exh valves will be installed... Next step will be to have my heads flow tested and then a little smoothing of the ports and deshrouding of the valves etc and then another flow test etc... I'm Still checking cams trying to match the best for this set-up... Once I get the flow numbers I will decide on a cam... PITA... this project will be a timely one... :t:

msalaba

There is one thing being overlooked in this. Performance American Style reccommends a min. Piston to Head Clearance of: 0.045" for steel rods 0.075" for aluminum rods 0.000" deck height with a Fel Pro head gasket would be correct for a steel rod. With a -0.008" deck height wouldn't there be a good chance to loose a piston at high RPM?

fifesjeep

No worries about the valve to piston clearance... that will be checked as soon as I get back from this deploy. I'll use my findings as a baseline and then compare those with my current plans to ensure everything pans out... I'm not worried though... especially with the heads only getting shaved down to 52cc's... The pistons have .140" dish... which, I might turn the pistons in a lathe to reduce the dish depth... just a little :t: and then have the block milled a little more... of course this all depends on what my measurments turn out to be.

Mudrat

fifesjeep wrote
I Still can't view those sites from these computers... There is a block on them... I can view JEGS and Summit Racing but not Crane, Crower, Engle, CompCams, Edelbrock, etc. I can't even get on evil-bay from here...

That's 'cause you're still deployed dude!!!

And yes! :t: I have the T18-1b Granny set-a-side for you... (If you're still interested).

fifesjeep

Mudrat wrote
fifesjeep wrote
I Still can't view those sites from these computers... There is a block on them... I can view JEGS and Summit Racing but not Crane, Crower, Engle, CompCams, Edelbrock, etc. I can't even get on evil-bay from here...

That's 'cause you're still deployed dude!!!

And yes! :t: I have the T18-1b Granny set-a-side for you... (If you're still interested).

Yeah I know man... Time is short. I'll be on medical leave (surgery) fortwo weeks and then I go on two weeks scheduled leave... so I should have some time to heal and slowly get back into working out/working on the Jeep :? I'll swing by your work.

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