luvemfast

I currently have 250hp (at the flywheel) and its not so easy, or cheap, to get that. ø89mm bore, longer rods, cutsom pistons, high lift cam, valves, retainers, porting, triple Mikuni's, headers etc etc etc All adds up. If Mega squirt is out of your league........ think you may be kidding yourself! Just go buy a Rebello

That's a sweeeet looking set of pipes! Got a YouTube link to hear it?

I've got triple Mikuni's in my factory EFI car. It's as easy as take off the EFI gear and put on the triples. Are you sure its high compression? It would need domed pistons or welded chambers. As the P90 heads have a big chamber, due to being made for turbo application.

Well, that would be a waste of time! If you have the capacity to model, program and run an CNC program to do the porting. You have the ability to spec the rest of the head to suit!

There is a 5 axis program down here @ Stewart Wilkins racing for an E88 head, or was that N42....... Dyno tested and works quite well. Think it works out to about AUD$5k for a complete 300hp+ head. There's no way they'd ever realese the G-code on that!

Baking soda. Better than a sand or garnet based medium. It breaks down and isn't so critical to clean out 1,000,000%

Great idea. I've been playing around with mine for years. Trying to learn the differences in changing jets and the effects it has on different circuits. I'm certainly getting better at it. But, would like to know what are the optimal AFR's also. I have a book that is kept in the car. It has notes on what the settings, jets are and the weather condition, then I note down the AFR's at different types of driving. Idle, Accellerate, WOT, cruise, pump, decellerate. I've also got the manual for the bolt on kit, which has pages with recommended factory settings. I'll scan it and post it up.

Same as everyone else, looking for better performance. I've found that for my set-up, 55 pilots work best. Just sharing my experience

Well, I tried running 57.5 pilots. Didn't have good results. Was running too rich at idle and fouled a plug at the track. Thought I had a major issue. But with some advise from some boys at the track and PMC, I went back down to 55's and dialed the idle screws down a 1/4 of a turn. AFR's about 14 and goes great. Also noticed I was running 230 airs, not 210's. I'm running a PMC bored L28 2.95L @ 10.5:1 with .59" lift.

Been a while since I've checked this thread. Been an interesting read. I'm currently running in my 44's- (used the Webber book recommendations for base) 55 pilot (52.5 affected higher rpm's) 160 main 210 airs 50 pump (45 would lean out and hesitate) This has made me want to try larger pilots.

Well, at least I've proven that there are guys willing to spend the coin on good bits. Which was actually my goal, as I have a PMC L30 myself. But I'm with Helix. This build should have its own thread and get back on topic of the RB26 head!

Oh dear Did we just go there? Is there an update from the OP?

thanks folks, bottom line is. He needs a regulator

Point being Tony, as you stated, It was just getting in early, before the usual banter started. We are just jelous down here on the pricing and availability you guys have! How much can you buy a strong Rebello L30 for? But then how much to ship it over here? Its good to see that there are guys prepared to get local talent to do these builds here. The main reason we don't just go turbo or RB, is to push the n/a cars to the limits without changing classes for our racing. Sorry for the off topic Peter. Is there any more progress with the NC34 twin cam?

4.5 pump would get pressure drop from tank to carbs though? And with a return line, that would work ok wouldn't it?

That money will cop a bagging from the US guys. They'll call you a rip off and say you can buy a whole Rebello motor for not much more. What you need to understand is that things cost more in Australia. That's just how it is. We are a long way from the States, so shipping can kill you. We don't have as big a market, so production costs for parts are higher. Our quality is better :oP And we get paid more. So it's more relative anyway. But, these PMC heads are becoming more common down here. And seem to be putting out the highest figures even more so now Les is on board.

My dad is close to getting his Z running, converting from EFI to triple 44PHH. So he has an EFI fuel pump. He has a choice of either 6 PSI or 4.5 PSI. Which would be best? No regulator and a return line. Thanks.

So basically....... Want bigger squirt? Check your balls!

My apologies. Brain fade me thinks...... It's the fact your idle screws are 2.5 turns that looks suspicious. Have you removed them and checked the tapers? Maybe they're damaged? Defiantly fix the pumps too. I have 44's. So 57.5 seems too large to me. But the books say 40's have larger pilot jets. Maybe try a 55, wind out ghe screws 1.5 turns and take it for a drive? 2000rpm is before ghd main jets even kick in, so not a concern at the moment. Basically, I'd try and get the pumps squirting out (about a meter) and the afr right at 1.5 turns.

What idle jets are you running? You've not mentioned. And it sounds like your issue, as previously mentioned. You should only be adjusting 1.5 turns on your idle screw, +- 1/4 turn. Any more turn, you need to change jet size.

Sorry, should have mentioned they were made locally in Adelaide, Australia. Designed by a Tarmac rally guy down here. They were too large for an L26, so should be sweet on my L30 I was going that way, when funds allowed. Already have 2.5" on, just need to connect. Sorry mate. Custom job. But looking into it. Any expert opinions on how these will go?

Hi guys, I got these off eBay. Never seen ones like this before. And thought I'd get some opinions on what to expect when fitted. They are tuned length, but a 6-3-1 design. The primaries are coupled sequentially, in firing order (1&5, 3&6, 2&4). Then they run the 3 secondaries into 1 collecter, that exits via a 2.5" flange. Should have it running next week, then take it to an exahust shop to mate it to my 2.5 system. (L30, domed Forged ø89mm pistons, ported P90 head, FJ20 rods, 76° cam, 590thou lift, triple 44PHH Mikuni's) So...... experts, Opinions?

F'ing lol Jake

Bah ha ha ha Look at all us newbies on the American forum. Lol Few world class engines hidden down under! And I don't like it Jake. That's why I'm going to swap it with my PMC L30

Had a good read and a chuckle with this thread. Can't wait to see Jakes 3.35L stroker going Then look forwards to seeing the Twin Cam Peter