I excitedly very much like this plan...

I win, so far.

Haven't heard back since the pully change... Did she blow ? You could make this easier just by installing a go pro on the wall of the dyno room. Were's the live feed?

I kept him in suspense. We didn't change pulleys on the first engine. We saved it for the second one, since we beat on the first one pretty good getting it tuned. Figured we should beat on the second one just as much.

We started with the same pulley combo that the engines had on them when I got them. They had a 3.75" pulley on the blower. With that pulley, they made 983 hp @ 6000 rpm and 962 ft lbs @ 3700 rpm. This was at just under 7 psi of boost. The compression on these are pretty low (compared to what I normally run), so I knew going in that they would need some smaller pulleys to make good power.

We then dropped down to a 3.5" pulley. They then made 1021 hp @ 6000 rpm and 1046 ft lbs @ 4000 rpm. There were still only making 8.6 psi of boost.

I figure that we should be able to get away with about 10-11 psi of boost on 91 octane. With 93 octane, we could probably squeeze 13 psi.

So, with that being said, we put a smaller pulley on. I thought we had a 3.25" pulley, but it turned out to be a 3.125". At first I wasn't going to try it on 91 octane, but I figured what the hell. After putting it on, I realized the belt was really too long. I put as much tension on it that I could and gave it a shot anyway. I didn't have a ton of faith that the belt wouldn't slip. It started out good with the engine making just over 12 psi at 3500 rpm at the start of the pull. However, as the rpms increased, the boost went down, meaning the belt was slipping. As rpms go up, the belt stretches. It stretched so much that the spring loaded tensioner completely bottomed out causing the belt to get looser. At the end of the pull, the boost was down to 10 psi. Needless to say, the power wasn't what I wanted. At 3500 before the belt started slipping and it was making boost, it made over 1090 ft lbs of torque. I expect the power to be in the same area. At this point we were out of time, out of gas, and out of energy. The engines need to get crated and shipped in the next day or 2 if they have any chance of being in the boat and running by Memorial Day. We just couldn't wait another day to get a belt and do it again.

Since the 3.125" pulley puts the blower spinning a little higher than it's safe limit, we are going to get some 3.25" pulleys to put on. These should put the power in the 1060-1065 hp area, with torque being just a bit higher.

This should be quite a bit more than what was there before. Should make the boat run pretty good. I will post some pics once we get them all finished up and spit shined.

THanks everyone for following along. Also, thank you all for the compliments and words of incouragement. Believe me, it is much appreciated.
Eddie

This thread is awesome. I just read from start to finish tonight. Wow is all I can say.

Do I still win?


Nice job, Eddie.

TRL - we expect every bit of video you can muster when it comes to sea trial. A fly-by from Reggie's dock wouldn't be a bad idea either. Hope she's all you ever wished for at this point.

Yah the flyby SRs house with Sr and Eric running out of the bedroom with there robes on again screaming what the @#$% was that man that sounded good anyways great job Eddie you pulled another one off

very nice work!!!

-Are the new valve covers done? post some pics of those!

Great job now how long till water test??ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ!ZZZZZZZZZ ZZZZZZZZZZZZZZZZZZ!

+1 on the Valve Covers

And again, thank you Eddie. I bet you never in your wildest dreams thought you would be dealing with someone as twisted and phuckd up as me....lol.

At first I was a lil dissapointed with the 1020HP numbers (yes Griswald you win...lol). But after talking to you and having you explain the pulley/belt situation it makes perfect sense. I have no doubt that they will be 1050+ with the 3.25 pulley and a smaller belt.
The thing that I respected the most was that you were nothing but brutally honest with the numbers. You flat out told me "1020 is what I can tell you now". After all that my brother and I have gone through on this boat, and all the false promises and outright lies, I cant thank you enough for your honesty.
I cant wait to get the boat and run it with Sr/Lil R/Eddie. I texted Lil R last night and he is pumped.
I dont know if a video would be a good idea...as there is a very good chance that I may be naked during my entire visit to NC....unless you are like Dean and are into that kind of thing.