QUOTE(soloracer @ Nov 9 2004, 08:07 AM)
I got my 20b from a canadian JDM engine importer. I paid $3000 canadian for it. It will cost me another $2000 canadian to rebuild and streetport. I have the Kennedy adapter, flywheel, stage 2 pressure plate and clutch. I think those were around $1200 US all together. I bought the RH radiator for another $1200 US. My engine management (Haltech E11) was another $1500 US.
What makes you think the Renesis is any more reliable than a 13b? Personally I think it might be LESS reliable than the older engines due to the newness of it all. I think it would take a year or two to get all the bugs out of it. The 13B had been around longer than dirt and anything that can be done to one has been done to one. For 200 hp all you would need to do is go with a large streetport or maybe a partial bridgeport. Most of the serious drag racers use carbs so that isn't an issue. This combination would be super reliable and cost around $2000 canadian including a full rebuild and porting.
I disagree. Porting a 6-port motor is neither easy nor that effective. The secondary ports already have a lot of overlap when they are open. HOWEVER, replacing the sleeves in those ports with some that are contoured (pineapple racing has some) is good for a substantial increase (up to about 10 hp) and they only cost you about $50. A 89+ engine with those sleeves, a good tuneable fuel injection, and header/free flowing exhaust should get you to about 190 hp. You MIGHT make 200 if you are lucky- at the flywheel, not at the wheels.
The port timing on a 6 port and the size of the ports if opened up (ported) is such that you will LOSE power except at extremely high rpm. "All the drag racers" as you are referring to run 4 port (turbo) housings, not the 6 port housings... but use the rotors from the 6 port motor (more compression.) That means you have to buy either 2 different engines (one turbo, one non-turbo) or a lot of individual parts to build one. The flywheel and front counterweight MUST match the year of the rotors for balance reasons. Turbo and NA rotors for the same years are the same weight, but the 86-88 rotors are heavier than the 89+ ones. (Third gen rotors are the same weight as the 89-91 rotors.)
Yes, you can work out various combinations for a race motor... but you have to know what you are doing or you'll build a hand grenade that will shake itself apart.
You can also build a 300-320 hp peripheral ported motor (naturally aspirated.) It'll be hard to start, won't idle below about 2000 rpm, no power below 5-6000 rpm... but it'll scream up to 10000 rpm and beyond. Oh... don't expect more than 30,000 miles or so out of it either. Ditto on longivity for bridge port motors, which can get you up in the 250 hp range, cost less to build (but are a lot more work) and have better driveability.
To recap: Up to about 200 hp from stock ports, but that's the limit. Beyond that start with a turbo motor with rotors from a naturally aspirated motor, and port the housings. To make big power for less money, turbo is the way to go.
Brad
p.s. Solo- just so you know I'm not "blowing smoke..." you know me as "rx7_ragtop" from the RX-7 forum.