I know...but 35hp is the difference between a 700hp car and an 800 hp car We'll see. I'm planning for 9500 but I'm also trying to get the peak as low as I can hoping there will be no need to go near 9500....but think of the sound it would make!!!!!
1 left. It looks like it will be a little tight coming out of the head and clearing the center pipe....but it look like it will go. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Will you be able to get those header -off- without having to pull the full motor? Just curious. Looks great!
I'm pretty sure they will come off. The rear ones come off for sure and I've been slipping the front ones in and out for the pic and fitting with no problem.
I think I was modeling the collectors wrong in the simulator. I couldn’t understand why everything I did kept trying to up the hp peak at 9500 when I told burns 8500. I played with the way I was doing the collectors and now have the hp peaking at 814 at 8800…803 at 8500, 804 at 9500. I would guess that when I put mufflers on like I told Burns I was going to do the peak will drop to about 760-780 at 8500. The software doesn’t have multiple collectors so I was just using the first one, but I get a very different answer when I combine the collectors and treat them as 1 long collector. I think this is the most accurate way to do it and I also thing the multiple collectors work better then 1 long one would so the software is probably under reporting hp a touch and over reporting RPM because high hp means I run out of air sooner. We’ll see when it gets to the dyno, but I think this is more correct now and 8500 is looking like the right place to stop spinning it. I also ended up going to 12.2” on the stacks and the cams moved to 170/114 lob centers and .001 more lash on the intake (good for 1.5hp )as the intake cam has pretty long accel/decel ramps.
You need an aluminum forge of some kind... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130348528616
Ok, that's it! All 12 done! And they Fit! Now I weld them up and do the collectors then I can get back to the ports. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Looking great Mark! In the fifth pic, 2 of the pipes show rather dark inside: are you burning oil in 2 cylinders? This is going to be one sweeeeet car.
Nice fuel pump. Is that an A1000 or the bigger one? I'm not sure an A1000 will support 800hp fuel injected.
I have ZERO experience with these cylinder heads... but I just want to give you one word of warning... Be careful that the cam lobes will physically fit. I ran into a problem once, on a completely different car where the cam lobes were slightly bigger than the factory lobes and I had to "massage" the spark plug tubes. If I would have built a more radical cam... i would have been done for. Just one of those stories I want to pass on to someone who is in uncharted territory before you spend 2-4k on cams
Yes, an A1000. Its rated at 600lb/hr at 45 psi. I think I need .45-.5 lb/hp so 360-400 lb/hr and I'm planning on 45 psi, so the pump should be good .but I can always add another one I guess as this one is a left-over from the blower motor.
Good point, but no worries. The blanks fit just fine and the finish ground lobes will obviously be smaller so I can't see how there will be a problem ..but if something come up I have a grinder and Im not afraid to use it. Image Unavailable, Please Login
I found a couple errors in my simulation today First I realized that I still had the 86.5mm bore in it but I changed to 86mm because that is what the head gasket people could deal with. That lead to the hp peak shifting up about 300 rpm and was slightly lower .which lead to me messing with everything just to be sure ..and I must admit that I am now more than just a tad confused. The simulator says everything is still right, cam lobes, cam timing, intake tack length, headers but I need a lot more exhaust flow than I had been using. Thinking back I hadnt really played with exhaust flow numbers I just took the intake numbers time 75% and plugged it into the exhaust because 75% is pretty standard. The problem appears to be the way I plugged it in at what lifts and shifting the flow to a lower lift (smaller valves come to full flow sooner than big valves) I need to get some real exhaust flow number but the numbers I have in now are pretty close to a head pre-loaded in the software that has the same size valves Im using .and the new exhaust flow number brings the engine to 875hp at 9000 rpm. Image Unavailable, Please Login
Are you at all concerned about the trans/diff/axles standing up to this beast ? I know there is history of 308 transaxles handling up to 700hp, but jeeze dude, those torque #s !! Even with the drop gear changes you have made, I'm thinking a standing clutch drop @ 5000+rpm would just spray broken parts sideways out of the rear wheel wells, no? And yes, Ive been following your awesome progress quietly, BTW.
