Guest Anonymous Posted July 27, 2001 Share Posted July 27, 2001 I am looking building a dedicated SBC engine for either the Weiand 142cc (small) or 6/71 (big) supercharger. What are the engine requirements for a street blower engine (without overkill, as I am on a moderate budget)? I take it for granted that forged dished pistons are a must. I have a nice set of L98 alum cyl heads that have been ported, bench flowed, racing valve job, ect, but they have a small combustion chamber (58 cc I think). Will I be able to get 8.5:1 out of these heads in a .060 overbored 350? Will the stock valves live in a forced induction enviornment? Has anyone tried ceramic coating valves and combustion chambers to reduce hot spots? Is a pricey aftermarket forged crank and H-beam rods really necessary if RPM is kept at 6500 or less? I know I know lots of questions but I want to do this right. Anyone who has been down this path and can give me some advice? Quote Link to comment Share on other sites More sharing options...
DavyZ Posted July 27, 2001 Share Posted July 27, 2001 Your heads are only 58cc heads?!? Wow, only the piston manufacturer will know for sure! I'm sure they make pistons that will work for your application & get the compression ration down to 8.5:1. If not, your boost will have to be somewhat limited I would think. Forged pistons are a must, and I suppose a forged crank is only necessary depending on the amount of boost you are running. Again, amount of boost will determine the kind of valves. 6500 rpm should be ok for a N/A crank (upper limit probably) but who knows with it blown? Perhaps one of the drag racers knows. As far as coating the pistons, one of the guys on this board, "takman57" owns a performace coatings shop in Dallas TX. Long, (dankinzle) is also part owner. Maybe one of them will chime in? The coatings you can do yourself if you wish as long as you have an airbrush or paintgun for detail work. Sorry I can't answer all your questions, but I'm sure there are guys here who can. Davy Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 27, 2001 Share Posted July 27, 2001 This this link, its Holley's tech info section. It answers some of the questions about Cast parts and what the Supercharger requires: http://www.holley.com/HiOctn/TechServ/TechInfo/SCTech.html Regards, Lone Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 28, 2001 Share Posted July 28, 2001 TY for the link LoneRider Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 28, 2001 Share Posted July 28, 2001 Oh, sry, u2 DavyZ! Quote Link to comment Share on other sites More sharing options...
Guest Night_rider_383 Posted July 30, 2001 Share Posted July 30, 2001 With a roots blower you need the strongest parts you can get. Yes you can thrown one together with cheap parts and cast parts but your asking for trouble. A roots blower gives boost as soon as you hit the gas so that means the whole time the engine is running there is a higher loads placed on the engine parts. The only way you gonna get your heads to work is if you use real thick (.060'' or better) head gaskets and dont deck the block. And use something like a 21 cc dished pistons. Only one prob with this is that with the piston .70-.80'' in the bore then thats not giving you a quench like you need, plus the smaller cc heads is made to give more low end torque where when you build a blown engine you need to build it for mid range and top end. If your engine has a C/r of 8.5:1 then after you add 7lbs of boost its like a 11.2-11.6:1 engine so you see you need the heads and exhaust set up to flow alot of air. I would look for atleast 64cc heads and as far as myself stock valves aint even good for mild hp engines like 300 hp cause they are to heavy plus 2 or 3 pc pressed Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 31, 2001 Share Posted July 31, 2001 Night_Rider_383, that is some good advice, ty. Youall come pretty smart down in Hicktown! Bust be alumni of the Univ. of Gojo . Quote Link to comment Share on other sites More sharing options...
Guest Night_rider_383 Posted August 2, 2001 Share Posted August 2, 2001 PARAGOD... LMAO. I liked that bud. If you need any more help or got any more ?'s i'll be more that glad to help you out. The two main things we deal with at the shop is 383 strokers and roots blower engines so i'm pretty sure i got all the info on building a blower engine that you could ever need bud Quote Link to comment Share on other sites More sharing options...
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