Low Revving 454

« **Reply #25 on:** October 16, 2015, 07:58:24 AM »

Quote from: che77y on October 15, 2015, 08:02:43 PM

hey just a thought how do your valvesprings look? If one or two are weak they could be floating causing a misfire ? Hmmm

The motor runs strong up to 4200, I am just trying to get a couple more rpms out of it. I don't think there is a hardware issue, just something with the timing/fuel.

I am going out next weekend and plan to bump up the timing a lil more and add more jetting. From there I will get a chance to check the plugs and try to dial it in. Either way I am bringing the boat home after this next trip and have plans to take it to GS Marine to have the pump gone through. I will have Greg dial in the carb (or diagnose another issue) at the same time. She should be ready to rock some trips to Elsinore before too long.

« **Reply #26 on:** October 16, 2015, 08:34:05 PM »

Quote from: che77y on October 15, 2015, 08:02:43 PM

hey just a thought how do your valvesprings look? If one or two are weak they could be floating causing a misfire ? Hmmm

Is that a possibility? Valve float at 4,200- 4,400 rpm? Worn valve springs or lifters? I mean, if you're floating, that's it for rpm's. 4400 seems a little low for that to happen though,unless there are some worn or damaged parts?
Anybody think that might be the case?

« **Reply #27 on:** October 16, 2015, 08:36:28 PM »

Quote from: garytcosta on October 16, 2015, 08:34:05 PM

Is that a possibility? Valve float at 4,200- 4,400 rpm? Worn valve springs or lifters? I mean, if you're floating, that's it for rpm's. 4400 seems a little low for that to happen though,unless there are some worn or damaged parts?
Anybody think that might be the case?

I was just suggesting other options. ... if a spring is wayy fatigued I'd say it's def possible especially if u have a radical cam w an aggressive lift and rockers that are at a different ratio putting g more stress......

« **Reply #28 on:** October 26, 2015, 04:46:47 PM »

No updates on the motor as I wasn't able to go out on the water this past weekend but I did bring the boat home to get some work done.

Does anyone know what these thing are on the bottom of the hull right by the pump. There is one on each side and they are about 6-8 inches long. Looks like a half round piece of pipe filled with silicone

« **Reply #29 on:** October 27, 2015, 01:01:30 AM »

Quote from: Mille170 on October 26, 2015, 04:46:47 PM

Does anyone know what these thing are on the bottom of the hull right by the pump. There is one on each side and they are about 6-8 inches long. Looks like a half round piece of pipe filled with silicone

That looks a lot like that Facebook fix for porpoising. There are better ways.

« **Reply #30 on:** November 11, 2015, 08:30:27 AM »

If the above is a ghetto fix for proposing what would be the better route to go? Would the current fix have any negative impact on top speed?

I am taking the boat into a shop soon to have the pump rebuilt and motor/carb tuned. I have been tossing around the idea of a droop snoot to get the boat out of the water more on a plane. The more I have been reading though it sounds like droops are only good for smaller boats. Would my hull size be better suited for a straight snoot?

A place diverter and droop are not in the budget this season, but if they can work together to get rid of the current ghetto porpoise fix and help me get more of the boat out of the water on a plane I will have something to save for.

« **Reply #31 on:** November 11, 2015, 08:57:12 AM »

Quote from: Mille170 on November 11, 2015, 08:30:27 AM

If the above is a ghetto fix for proposing what would be the better route to go? Would the current fix have any negative impact on top speed?

I am taking the boat into a shop soon to have the pump rebuilt and motor/carb tuned. I have been tossing around the idea of a droop snoot to get the boat out of the water more on a plane. The more I have been reading though it sounds like droops are only good for smaller boats. Would my hull size be better suited for a straight snoot?

A place diverter and droop are not in the budget this season, but if they can work together to get rid of the current ghetto porpoise fix and help me get more of the boat out of the water on a plane I will have something to save for.

I think I'd wait to see what GS has to say about all of the problems in general. With his experience he should be able to make suggestions for changes.

« **Reply #32 on:** November 11, 2015, 03:21:26 PM »

Quote from: Mille170 on November 11, 2015, 08:30:27 AM

Would the current fix have any negative impact on top speed?

Yes, that creates drag!

Mille170

Re: Low Revving 454

garytcosta

Re: Low Revving 454

che77y

Re: Low Revving 454

Mille170

Re: Low Revving 454

Flusher

Re: Low Revving 454

Mille170

Re: Low Revving 454

00 CP

Re: Low Revving 454

Flusher

Re: Low Revving 454