Zone 5, your technical insight on this thread, has been amazing.

Anyone is welcome to stop by the Piney Flats Industrial Park and drop in on us. The park entrance is 15 miles from I-81 and is 7 miles south of Bristol Motor Speedway. We lease 7500sq/ft of a 27Ksq/ft building. This houses offices, inventory, and cylinder head shop and our retail speed shop. We are open from 8;30AM to 6PM Monday thru Friday. Photo’s can be taken. You can meet us face to face or if you are going to PRI we are Booth 109 in the main hall in Indy.

I was going to start a thread about max compression ratio on a blower application, but I think I'll pass, I may pm folks individually to get their opinions, carry on with this senseless crap

Im at 9:1 , with 155ish cranking compression, 6lbs boost, non intercooled, 34 deg total timing. Been that way for many years. Intercooolers going on this winter, to see what they do for me.

Thank you for the reply.

That's about as far as I'd push a pump gas blower motor especially non intercooled. It's all about managing cylinder pressure. You can have more static and less boost for better throttle response and idling/low speed quality, or less static and more boost for more HP. Everything in an internal combustion engine is a compromise.

I prefer 8.2 to 8.5. The bigger the engine the lower I prefer. I tried going to 7.4 on some 605s. I usually use a theoretical compression of 184 psi max.

A blower.

If this was any other thread, I'd love to talk engines with you. But there is no way I am going there on this one.

Geez, all I have to do is look at the title and the number of pages to tell if a thread has turned into a pizzing match. If it has "cylinder heads" or "camshaft" in the title, and it suddenly balloons beyond 20 pages, you can safely bet that it has degenerated into a "he said, she said" type of thread.

then post it somewhere else... I would love to hear your findings it's easy to post other stuff why not now? If your so great let's see what's offered