It’s cool to keep a gauge handy for periodic fuel pressure checks. IMO to keep one always in-line is just a weak point that fuel will eventually leak, especially if you drive a lot. Dub daily and drive ‘em! ⚡️
Well the gauge served its purpose letting you dial in the psi you wanted. It’s running good and your carbs aren’t flooding so you’re pretty much done with the need for it I’d say 😎
Agreed. It’s coming out on my next day off. I’ll probably dedicate a line to each carb coming out of a “T” at the regulator, instead of one line out of regulator then T’d to carbs🤷🏻♂️
Yep its not really zero fuel pressure.......put that gauge outside engine compartment and it wont get skewed. Drove to summit racing and got my aeromotove gauge for like 39 bucksish
Great info. I’ve got the same gauge in my buggy and was wondering why I was get fuel pressure fluctuation. I’m going to temp in a vacuum/fuel gauge and double check mine but will probably remove mine as well. 👍👍
Yeah I need to fix that radiator leak ASAP 🤣. It is nice to experiment with fuel pressure to tune for optimal performance instead of just installing an electric fuel pump and calling it good. I noticed a noticeable difference from 2 1/2 - 3 1/2. Cool experiment and great video appreciate the information. 🤙
I’m wondering about the 90° club too. Regulator looks like it’s doing great! That Malpassi has a return to tank at the bottom I believe, it might relieve some pressure possibly or it has enough heat it’s evaporating the fuel before it gives an accurate reading. I run an oil filled gauge on my turbo engine and it reads accurate with no issues. But I’m also using a high pressure EFI fuel pump with that style regulator.
Well it seems that is when the small ends of all four rods are equal distances horizontally from the centerline of the crankshaft. That would also make all four rod journals on the crankshaft equal height from the floor of the case. Maybe this is the most relaxed position or resting state for the crank/rod/piston marriage. So if an engine had a decently balanced rotating assembly, good tuning, good compression, timing etc., then that would give the moving parts enough “umph” to push through whatever cycles it need to in order to find that relaxed state. But man, I really don’t know. It just seems to happen consistently when a good build is tuned right. Conversely, it lands wherever when something is wrong, like valve lash, timing, weak spark etc. Again, I really don’t know. No one has answered it yet 🤷🏻♂️ Thanks for checking it out🤙🏼
On the outlet side. I like to put it on the inlet side just to check if the fuel is pushing the advertised psi, but ultimately on the outlet side to ensure the regulator is actually regulating, and if so how accurately. That Malpassi regulator has been spectacular so far
Great video. Same happened to me I was reading zero and it drove me nuts, but I was using a vacuum/fuel pressure meter so I am more confused at this point xD cause my gauge does not use oil eventhough my gauge was out of the way of heat and it is still doin the same sh#t . By the way did tht bellcranck linkage solve the issues with the oppening of the butterflies?
Thanks man. Yeah that’s a tough one to figure out. For me the gauge dropped psi when I heated it up. The bellcrank did help my carb synchronization. I would tune The old hex bar style, and it seemed like after things warmed up it would develop play. So it would be synched at idle, when cold, but then be off while hot and running. It wasn’t too bad, just enough to annoy.
Yes. It’s too coincidental to not mean something. Rumor has it that it just means a good tune, but I was welcoming further technical input. Seems like it might be the ‘relaxed state’ of the piston to valve relationship but I really can’t confirm.
