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Please help. Looking for ANY RX1 turbo install instructions, mainly trying to figure out what was done with the so-called "Pitot tube", which I can only figure out was an adjustable, fine-pressure PSI regulator connecting the charge (boost pressure from intercooler) air to the carb bowl vents...

The Full Power Performance website is long gone, just searched today. Left a VM, hope to hear back soon... Please help. Looking for ANY RX1 turbo install instructions, mainly trying to figure out what was done with the so-called "Pitot tube", which I can only figure out is an adjustable...

When I raced GT1 in my old 500HP, 1800# Porsche 930 in the early 1990's we discovered that the big Garretts we were using designed for semi-trucks liked a little back pressure on the charge air side of the snail, though the later 750+HP Twin turbo Porsches using two, much smaller snails liked...

Turns out the NEEDLE JET HOLDER (photo) had come loose. As mentioned above when fast idling at 4k, covering each carb with my hand resulted in only #4 having an INCREASE of RPM instead of a decrease. Pulled that vacuum cap off, and the holder came out with the slide spring! Put it all back...

Liking these offerings so far! The connecting boots actually are cracked on #2 & 3, but 1 & 4 are still good. The boots are going to be replaced, but the cracks are not affecting performance yet. I have an AFR but the sensor went on the fritz just before this problem popped up, so it's of no...

Wednesday's puzzler: You have before you a rack of low-mile carbs on (for the sake of the puzzler quiz we'll use) a good-running RX1 with 4 carbs. One day, you go out and start the perfectly-running RX1. This day you notice the exhaust note seems to be hitting on 3 of the 4 cylinders. You...

I bought a Uni-Syn tool for tuning my Porsche in the 1980's, had it in my tool box and wound up using it for syncing every RX1 carb rack on every engine I've used or sold to my customers since 2013. Contrary to popular belief it does NOT take more time than using any other tool made, and in...

Thanks, I was seeing 70 at 7 as well, even on grass, standard reduction ratio on my first '03 RX1 purchased 2011 with 2400 miles showing, and my second one purchased 2013. Never had any place to run them any faster than that, kept running out of room.

Everyone wants to talk about WOT top end speed, but I couldn't care less. What I want to know is what does your sled do (MPH) at 7000 RPM, 7500 RPM, 8000 RPM and 8500 RPM on long, flat, smooth surfaces like lake runs? Thanks! Gerg

Everyone wants to talk about WOT top end speed, but I couldn't care less. What I want to know is what does your sled do at 7000 RPM, 7500 RPM, 8000 RPM and 8500 RPM on long, flat, smooth surfaces like lake runs? Thanks! Gerg

I've been flying an RX1 on my gyrocopter since 2011, been the unchallenged climb champ for two-place rotorcraft ever since. Now Rotax is marketing a turbo aircraft engine that will finally be a serious challenger, it's now time for me to boost this beast to stay on top. Typical sled turbo...

I need some APEX spark plug coils, so I checked on Ebay. Those sellers are all listing their coils as compatible for Apex and Phazer, but the shop manuals indicate they very different coils (although the mechanical fit is the same ), Apex coil spec is 5k - 6.8k ohms, while Phazer coils are 10k...

For firing order, look in the manual under valve clearance maintenance, the valve sequence and thus firing order is 1-2-4-3. In the original RX1 Manual that is page 2-10, and it is the same page on the following Apex manuals as well. This is why a bump in HP is realized when changing the...

There is a lot of variation on compression testing which largely depends on your test set. I never seen more than 150 PSI on any engine with my test set, no matter what type or make. As for Yamaha I've been flying them since I built the first YG4 in 2012. I've compression tested YG4 RX1 &...

I've done compression checks on numerous RX1's with anywhere between 400 - 10,000 miles on them. The extension hose to reach down into the spark plug hole seats with a rubber O Ring and I never tighten it beyond finger tight. On a cold engine, all plugs out and using the starter motor to crank...

Here are my methods for a leak down test> 1. Never do a leak down test with piston at TDC, always do it at 15-20° BTC. 2. Don't get your panties in a bunch over getting the angle perfect. Stick a long, skinny rod (a clean wood dowel or bamboo Shish kabob sticks from the grocery store work...

Ah, I've seen setups like this on other aircraft conversions, I always thought it would lead to mid-range power loss due to improper Helmholtz wave disruption at the intake valve seats. I figured though it may prove WOT improvements on a dyno for a flat-out ice drag race, in practical...

What is ECP?

Thank you! Holtzman was what I was looking for, lost track of the name/web site address.

Any RX1 Carburetor Vacuum Chamber Spring Modification Sets Around?