540Fever

Thanks for the advice on this. I will check timing again since I never went over 3k when checking. I didn't think it would run back below 40, so there is a chance it's 34* at 5000.
I'll also check plug gap I'm not sure where they set them and I didn't check when I had the plugs out.

Thank you

bleek

Am I the only one here feeling like this is just a horrible setup? A 29p on a 27 Fever? or spinning a 26p to 6300? What prop are you running? What year boat? Is the bottom straight? What Drag racer built this high revving engine? A dominator in this day and age? Why not build a 5200-5400rpm engine? A 540 only pushing this boat to 73mph, I had a 27' Fever with a Tyler Crockett powered 502 with Aluminum heads, headers, and factory efi that would walk past this boat at 5200 rpm. Once again, what drag racer built this engine? I'd put a 21" mirage on that bad boy and see what kind of rpm we can really turn, maybe get the timing up to 50*.

badluck

As a reference, I had a 27 From -93 and was running low 70s with a HP500 carb and 75mph with a 525SC.

540Fever

That was a lot to take in. Some of your story isn’t accurate but it’s a long thread of comments, so it’s to be expected.
I’m trying to dial in the boat so I don’t get walked by some Tyler Crockett engine.

540Fever

Good info thank you. What props was that with? I would expect my setup to run close to your 525.

SB

iTrader: (1)

Lol.
Good morning. Hang over this morning ?
Just busting balls, as you where.

bleek

Answer some questions, you have a long way to go before you outrun that 1996 27' Fever with a Tyler Crockett 502. What prop are you running? Left Hand or Right Hand? 3,4,or 5 blade?Is it still the correct pitch? Is the boat straight or has it developed a hook? Is 3 on your trim indicator parallel to the bottom or is 2? Have you indexed your indicators? You mentioned drive was taken off of boat, did indicator cable get re-indexed? What year boat? You can keep wasting your time with plug gap, maybe a bad distributor, run a larger wire to your distributor, I could keep going, but there are a lot of unanswered questions about your boat. Sorry I came across as a dick last night, but your engine is not helping you. That Dyno you were hooked up to must have been very optimistic I've owned a couple of 27 fevers and they were rockets. Tyler Crockett made mine scream with a 502, Brodix Heads and EFI @ 5200 rpm. 78mph with a left hand 28P Bravo One. It also had no problem getting on plane unlike your 540. Its still out there running, I just saw a video of it on July 4th.

boostbros

not sure what issue you have but i,ll throw this out there we run a 25 foot active thunder with a 540 XR drive and 26p bravo 4 prop delco voyager est ign single big carb we run 34 degrees timing we can get on plane with 6 guys in it we turn it up to 7000 on a cold day 6500 to 6800 on a warm day its starts easy does not load up does not stall around the dock and is an absolute blast to drive its a non stepped hull it does not hurt itself and has been extremely reliable . rpm is a bravos friend vs to much torque to early!

540Fever

Let me add a little context to some of this and answer your questions.

Boat is a 1998 27' Fever with a single step.

LH 26p is what was on the boat originally before the rebuild. I was noticing slip and it was clearly too small IMO since it WAS CAPABLE of hitting 62-6300. That wasn't something I did regularly, but somethings the tach would shoot up rather quickly. I typically had a 5500 limiter in it, but pulled it a handful of times out of curiosity.

Since the original motor was spinning the 26p and we became aware during the rebuild that the motor had several issues, I assummed I would need a larger pitch prop. I ran across this labbed 29p off a member that owned a 29 Fountain for a really good price and figured it would be a good starting point for $350 bucks. So, there is a good chance this prop is just too big and I can't use it. No worries, only out $350 and I'm sure I can resell it. The guy I bought it off of had a 29 Fountain that ran about 78 with it, which I thought would align to roughly what my boat would do.

The boat is straight and handles the water well unless you get up around high 60's and pull the tabs and drive out - then you can start to feel it walk a little, which IMO is to be expected.

I rechecked trim and tab settings to see what is parallel to the hull. This was done after I got the bot back - the drive was slightly different tabs remained the same.

The reason I'm on here asking questions is because I agree with your assertion, the boat doesn't seem to be running as I would expect. I ran 73 with the old motor before the rebuild on a 26p prop and now I can only hit 71-72 with the same 26p prop and it will only rev to 5800. Ideally, I don't want the boat running at 5800, so I believe the 26p is still too small. My comment around the engine spinning to 6200 was purely for comparison sake as now it will only turn 5800. I think 5400 would be a better sweet spot for the engine and if you look at the dyno numbers, that would be inline with the graph.

Someone earlier on mentioned prop slip and with my setup, 1.5 gear, 26p, 71mph, @ 5800 shows 24-25% slip. There could be several variables, but I don't think this prop is optimal for the setup.

I also do not want to run my boat @ 50* or timing or 40* for that matter, which is why I'm thinking about swapping out this DUI7000 distributor for an MSD. This has nothing to do with performance, but trying to keep timing happy and avoiding detonation. My shop told me they've had issues with these DUIs in the past holding timing and I could clearly see on my gun it was @ 40* of timing at 3000 rpm. I did not check the timing above 3000 rpm as I assummed it wouldn't pull timing and get back down to 34* where they told me it was set. So, today, I will check the timing again and see where it's at above 3000 rpm and if it really drops back to 34* above 5000 rpm as they told me.

Thanks

SB

iTrader: (1)

What elevation are you ?
you have a drive shower ? What kind ? Any pics installed on your boat ? Have you removed it to test if causing your slippage ?

Bleek - with the brutal slip #’s , most of us agree somethings up with prop or boat.
His dyno sheet is wuite low for what i would expect that combo to make. I believe some sort of tune issue or hardpart (ignition or carb ) issue. Again, that cam is not huge. Should make best power propped for my estimate of 5500-5600rpm.

Good info being discussed. Very interested to see what the lurking issues are.

btw: may have missed it. Was best prop for last motor put on ? And how did that perform ? Anything to outdrive changed since last motor ?