Originally Posted by DrCharles
Quote
And this is why I do not come on here much, you guys are all worried about the timing and the boost, and I have built anything yet..........I need the build ideas, the rest is the learning curve


Sorry you took offense to everyone's attempts to help. Our advice is trying to save you money, time and frustration if your "learning curve" results in melted pistons, blown head gaskets, etc. I have been through this over many years experimenting with my BMW factory turbo (and intercooled) 3.5 liter six ("semi-hemi" head). After much experimentation, I learned the hard way that 93 octane will work with 15 psi boost and a static 8:1 CR (good forged pistons) and 35 timing only with an MSD boost retard unit set to about 0.75 deg/psi retard, which maxes out at 15 deg. So really only running about 23 timing at full boost. Then the exhaust temp became the limiting factor (peaking near 1600F which is pushing it even with Inconel valves).

The number may vary with your larger diameter wedge chamber but the principles are the same. Is your Procharger setup going to have a large intercooler? It should.
I also recommend reading Corky Bell's "Maximum Boost" cover-to-cover before you buy anything, or MacInnes' "Turbocharging", or both.

Sure, you can push things a bit more with water/methanol injection, but you'd better have safety devices in case the tank runs dry or the pump fails while you're at WOT.
The rule of administering new drugs is "start low, go slow". Same with boost. Best of luck! up


Well its going to be 93 with water meth and full timing.....Might start with race fuel and water meth, but at 10psi I should not need it....As far as cubes, I am happy with the 400/470 combo that JE and I worked out. Lots of room for the rings where they need to go. Head gaskets and rods are my two big questions, and once I figure out those, I will pull the trigger on the pistons. and then the rest of the bottom end after I get those. Cam will be interesting too, not sure who to call on that one either yet. It will be a Comp solid roller though.

https://www.procharger.com/faq

"And while a reduction in timing can save a motor from detonation, the excessive heat which was causing the detonation is still present. Intercooling, on the other hand, actually removes the heat which causes detonation, and allows higher boost levels to be safely run with full timing on pump gas. This produces the maximum benefit in terms of both horsepower gains and engine protection, without any additional maintenance or hassle."

" For carbureted engines with compression ratios of 9:1 or less and boost levels in the 8-14 psi range, pump gasoline works very well"

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk