Lasse wankel

Me and my friend are planning to convert our 13B PP motor to alcohol this winter. This summer we only mana ged 11.45-118.2mph with our RX-4 drag car (weight 1870lbs w driwer) I think the engine makes 280 at flywheel. Is there anybody having a Ron's alcohol fuel injecton setup on a PP motor pros and cons? Any inputs?
Thanks.

Rotortuner

I am thinking about doing this on my PP12a. In am still tuning mine motor in. i run a 48 IDA, and i was thinking about getting some huge jets drilled and running the E85 fuel. Not sure yet though. What are you running for carb or FI?

CJG

Lasse wankel

WE are running a straight 120mm manifold with a Weber 55.DCO-carb. Housings has a little more timing and flow comparing to the factory housings and are also squared not D-shaped. We plan to use a RonsFuel injection with a straight adjustable length manifold w slide mechanism. Wegonna dyno the engine w carb and gasoline first then switch to injection and methanol.

Rotortuner

So what did the motor dyno in at with the current setup? See i wanted to run the E85 and your talkng methanol. Just want to make sure were on the same page.

CJG

Lasse wankel

We haven't dynoed our PP motor which is on 95 octane unleaded. Only tuned it at the dragstrip. We vill dyno it this winter with the carb and gasoline, then try injection and Methanol. Ihave no idea what E85 is can you please explain?

Regards: Lars

Rotortuner

Ya, the E85 is denatured alcohol. (Ethenol). I am not very super knowledgable on this, we need to get some more people on this thread that know more about it. I think PJ on here knows some and i think it was REVHED i think thats running the E85 in a street car. I cant remember. We were discussing this a couple months ago. I have another question for you though. When you guys ported the exhaust, did you guys remove the sleeves? If so what did you guys do for a header pipe? Thats my major delema right now.

CJG

Lasse wankel

On our PP motor we have removed the steel sleeve becausse the transitation from the inner port to the sleeve is to big. Instead we have removed it and welded the port smaller in diameter (be very careful tough it can change dimensions) The port has a 7 degree tapered outlet all the way to the gasket. Factory PP has the same setup. We gained around 10% more flow by doin this but it takes some time to do it right. If you have a 12A PP i would definetely take out the steel sleeve becausse of the little 36-38mm outlet hole. I think it's wise to paint some ceramic stuff on the aluminium exhaust ports then to create a thermal barrier. I think Powerhouse engineering sells a kit for aluminium.

Regards: Lars

Bitchn7

Good time to find this thread.
my brother wants to run methanol through his 51mm IDA into his 13B PP in his drag car.
Whats the benifits, how much extra power do you think will be available without having the usualy higher comp to suit??

Lasse wankel

I think there would only be 5-8% increase unless you raise the c:r and switch to fuelinjection then the gain could be 15-20%. Converting to alcohol with the Weber carb is not so easy becausse you have to run twice the amount of fuel to gain some hp. I would suggest switching to a pair of IDA carbs and use the largest needle valve you can get.

Rotortuner

Ya I have the sleeves pulled and have run the motor but once the sleeves are out you have to run a 2 and 1/2 inch ID header. So i guess my next project is making a 321 SS custom header. I do have one more question, What are you guys running for primary header tube leanghth and into how big of a collector? I am going to try a really short primary tube leangth and into a 3 inch collector.
Hey bitchin 7, what s your brother running as far as housings and set up?

CJG

crispeed

Try this!
1.9 to 2" ID. by 13.25" runner length.
Collector 2 3/8" ID.

Rotortuner

Hey thanks a lot crispeed. But I do still not quite understand why its OK to choke down into the 2" ID? I mean my housings not that the sleeves are out, the housing is now 2.5". So do you still think teh 2" is the way to go? or should i go with the 2.5" to be on the safe side? Also What intake runner leangth should i use? I have a really long intake right now which is one that i made, its like 9-10 inches long, from what i hear this is really long as far as these go but the guy who helped me build my motor said it should be long in order to help increase intake velocity and cool intake charge which in tern cools the engine. Does this sound right? he also recomended a header leangth of 23 inches. One more, are you measuring the 13.25 from the inner port wall or the header flang onto the motor? Thanks for the help.

CJG