Thread: Help me out, thinking weird again

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Originally Posted by pat mccarthy

yep i posted the cam what i think would be a good place to start, line 34 682/654 @050.274/280 .lsa.110 i think the 220 runner heads should do the trick

Thanks Pat, I'll run up a DynoSim on 'er tomorrow.

Good info guys!!!! RHS 220's, anxious to see how these numbers compare to the -10's!

My apologies to those who read this before 6:25 PM, I messed up the DynoSim by not using the correct stroke. Had to go back and re-run it.

Moved the static compression ratio up to 13.50:1 to work better with more cam.
Used Pat's numbers, moved the centerlines around a little to get to where I wanted to be.
0.050" duration 274/280
Lift 0.682"/0.654"
116/104/110
Timing events 21/73/64/36
RHS Pro Action 220 cast iron heads, 23 degree valve angles
RPM HP TQ
3000 204 357
3500 244 366
4000 305 401
4500 395 460
5000 493 518
5500 582 556
6000 662 579
6500 729 590
7000 763 572
7500 783 548
8000 778 511
8500 776 480
9000 742 433
Peak volumetric efficiency 133.9% @7000
Peak BMEP 251.8 @6500

Well, the old hot rodder's axiom is....If some is good, then more is better, and too much is just right. Raised the static compression ratio to 14.50, all else the same....
RPM HP TQ
3000 217 380
3500 259 388
4000 318 418
4500 408 476
5000 505 530
5500 593 567
6000 675 590
6500 743 600
7000 778 584
7500 800 559
8000 798 524
8500 797 492
9000 780 455
Peak volumetric efficiency 135.0% @7000
Peak BMEP 256.8 @6500

Holy buckets!!! That is some mighty tall and very impressive numbers Richard!!! Sure seems to like those bigger heads!!!!!!!!!!!!!!!!!

yep i knew that... the cam is a McC custom . getting the CR up there going to take some work with the small stroke may have to go custom on piston s .i was thinking all of 13.5 but 14.5 is good to if you can get it. have to look in to that abit more but it needs all you can get

I can see this painted on the front fenders....
---327 CRANK, IRON HEADS---
Or maybe on the sides of the hood like they did in NASCAR

Pat, I tried the 235 heads, but they were just too much. I wish they would have worked out, because the valve angles are 14 degrees, allowing a tiny little combustion chamber so that 14.50 would be easy to get. Thanks for the cam specs, worked out great, as you can see!!!! I hope the timing events make sense, because they are kind of bass ackwards on the intake and exhaust centerlines. They worked out that way because I just kept retarding the cam and every time I retarded it, power went up, so I ended up with those centerlines to get the 110 LSA you called for.

i would think a guy could roll the head s some to get the CCs down they make that head in a 50 cc chamber that would be the one to start with . cam looks ok . cam could be nail down but would like to see what more lift would do for it but if this is a real build more cam may be hard to fit in .every thing looks good on paper

Dialed in 0.750" lift intake and exhaust. Picked up 5 hp and 4 ft/lbs.
Dialed in 0.800" lift intake and exhaust. Picked up 7 hp and 6 ft/lbs.

Originally Posted by techinspector1

Dialed in 0.750" lift intake and exhaust. Picked up 5 hp and 4 ft/lbs.
Dialed in 0.800" lift intake and exhaust. Picked up 7 hp and 6 ft/lbs.

well start at 800 with lash your be close were i would want to see it and you will see some deflection valve should be titanium as rpm could be be abit more in life need a very good oil pan with all the bells and whistles. dave you may need a job at a bank

been gone for a couple days----for Tech--the longer rods will let the piston dwell at top and bottom of stroke which will allow for filling the cylinders a little better, but--(there's always a BUTT)--valve notches might need to be a bit deeper as the valves will be more off the seat while the piston is up there---that high a compression does create some blockage to the flame travel from the dome(hemi would help) Yeah, Dave---they ran hemis in everything back then--look at one of them!!!!

Thought about a hemi, Jerry....Got to stick with an sbc though...Found a bit of information on the history of the car, it was at one time powered by a 327 and 4 speed. I realize this engine won't replicate it, but it'll (sort of) be along those same lines....

PS--also some sponsorship considerations--you know how that goes!!!!

Originally Posted by Dave Severson

Thought about a hemi, Jerry....Got to stick with an sbc though...Found a bit of information on the history of the car, it was at one time powered by a 327 and 4 speed. I realize this engine won't replicate it, but it'll (sort of) be along those same lines....

PS--also some sponsorship considerations--you know how that goes!!!!

hell jerry will help you out on the Hem I i was leaning on one when i was at his shop . nice shiny aluminum he told me he was throwing it out the big block chevy would work better yep like i said trying to get 14to1 going to be tuff with big valve nochos and it going it get crowded in there but 13.5 should fly . it will work. move down on the rod from a 6.200 to a 6.125 pumping speed will go up a wee bit less dwell time just leave the line at 9500 and not the 8000 like you were you will be the first long air into outer space

Any engine coming off the line at 9000 RPM has got to be the sweetest sound known to man!!!!!!!!!!!

For sure on the 6.125 rods???? Want to have it right before I start shopping!!!

Dave,thought you said you wanted to drive it on some cruise nights???.