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Decent run but

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Old 05-28-2006, 11:49 PM
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Default Decent run but

Ran the Harley out to Pompano bouys for a scuba dive - had 8 people on board, 80 gallons water, 180 fuel, and ran 39.8 gps mph at 3600 rpm. Still cant get any WOT over 4000 though I do have a trim problem with the drives right now.

What concerned me most is two things:

1) When I hit the gas to get on plane I get a lot of steam out the exhaust which seems a bit odd.

2) oil Temps go to 220 at 3600 cruise and oil pressure seems to drop quite a bit when I stop running. At 1000 warm I get 45-50 psi at WOT hot I get 40, when I come off plane and idle around thereafter with hot oil in the 200 range - I get 25 psi. Oil is straight 40 wt.

do I have a problem? Water temps BTW are always the same 160.
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Old 05-29-2006, 06:48 AM
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Default Re: Decent run but

Harley?
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Old 05-29-2006, 07:49 AM
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Default Re: Decent run but

A Harley super Sport, right? They are big cool boats. What engines do you have? Oils presure/temp issues sound about normal for a little to small oil cooler or not enough water flowing thru it. The steam could also be a sign of not enough water flow.
Your water temp is fine.
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Old 05-29-2006, 08:48 AM
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Default Re: Decent run but

sounds like you need bigger oil coolers, you have the 502's right? Whats the trim problem? THe WOT at 4000 RPM's if you cant pierce the surface of the water with your surface drives and props thats going to be a big problem, those props need to be at the surface to work correctly. If they are fully submerged then that is going to be a part of it. St 40 weight might be a little too thick for stock 502MPI's if it is too thick it wont be able to dissapate heat very fast, will retain heat. Try a 20W50 and see if that helps with the oil temps and look around for a larger oil cooler if yours are too small. I had really messed up readings on my baja's oil pressure gauges and I barked at the engine builder and he swore up and down it was okay, only real way to tell is to put an oil pressure gauge on the engines directly and look at them from time to time, Ill bet like my baja the gauges were bad (old VDO gauges) I put in new senders and new gauges and the readings were night and day but the gauge on a tube off the block told me I was fine with oil pressure the dash did not even come close to reflecting what the actual was.
You still have the old stuff in the dash and original senders from the stock engines in the boat before you went to the 502'S???
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Old 05-29-2006, 12:15 PM
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Default Re: Decent run but

They are rebuilds - 502 with 850cfm carbs. One is counter rotating. Have had nothing but problems with these motors two rebulds later by a dif mechanic and now they are getting more reliable.....- do NOT get anything from Bill's Marine in Davie/Lauderdale. Very unethical and has no bucks so you cant even sue him. Junk dealer.

I blew a seal on one of the rams that trims the arneson drives...scheduled a pull out for next weekend so I can replace/rebuild them. Also thinking of putting new throughulls for better water pickups - dont like the ones I have - seem inefficient.

The Harley was built in Bartow FL and is basically a cigarrette hull (took one than burned and sank for the molds...which was made taller and wider (by default) so that you can stand in the cabin. Kevlar and glass and foam core but still heavy - about 16000 lbs.

I agree on the oil coolers - can anyone recommend a decent set within reason price-wise?

Many Thanks

BTW -All gauges and senders were replaced a year ago with Gaffrig/livorsi everything. I also put fuel pressure gauge on motor and am thinking of putting oil PSI guage on there as well- just not sure where to plug them in.
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Old 05-29-2006, 11:51 PM
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Default Re: Decent run but

You stated that you have ASD8 in line drive units. Are you not able to trim one of the drive units at all or are the seals leaking in the trim and will not hold trim position?

If the drive will not trim then there could be the source of the RPM problem.

Your boat is pretty much like Steve's (is yours a 42' also?) but we do not know the reduction ratio in your boat. If you are running a marine gear with reduction ratio, why are you counter rotating the engine? Maybe we should clarify which transmissions you are using?

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Old 05-30-2006, 07:57 AM
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Default Re: Decent run but

Steve - I have been emailing you for a while - changed names to protect the innocent ;-)

Borg Warner trans 1.53:1 model 71(I think- hard to read label)
They are the mid 80's variety (rebuilt 20 hours ago as a maintenance measure) of transmissions - not reversable so went with counter rotating port side motor.

Trim problem is a recent one - I actually blew a trim hose on stbd arneson drive a few weeks ago. I have a haul out scheduled but need to wait for it. So this past weekend I was running with both drives at 20-degree angle (deep).

I am planning on replacing both trim hoses and rebuilding the steering ram since it seems to be losing a bit of power steering fluid due to a seal leak.

Rik, if I had to do it all again - I would change the trans out for higher reduction and make both motors normal rotation. It would have allowed me more motor options and I could have avoided the rebuilt power plants and gone bone stock like Steve...but alas...I have what I have and with 2 in college it will have to do for now.

Thanks for ideas and suggestions.

Last edited by Swamplizard13; 05-30-2006 at 12:27 PM.
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Old 05-30-2006, 12:27 PM
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Default Re: Decent run but

Rik - do you sell a ram rebuild kit for the ASD8 steering ram?
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Old 06-05-2006, 04:10 PM
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Default Re: Decent run but

Yeah Steve it's me in Boca area. I am pulling it out this thursday night for a few days of work at a do it yourself yard in FLL. Planning on replacing the blown trim hose, see if I can get the steering ram rebuilt, change the gear oil in the drives, and do the zincs. I am also considering putting some ventilation snorkels on it while it is out (The snorkels will be threaded on top so I can cap them if I find they are not helping any and are not needed).and I need to calibrate the trim guage/senders....they are way off. I've also decided to go to through hull water pickups - the things on the transom seem flakey to me and I think the weld at the 90-degree bend is rusting on the inside. These motors are working hard enough without getting too little water.

I'm dying to try some different prop combinations and get to 5000 rpm at wot but having a hard time finding anything that might work around here.

All the calculators are pointing at 17x19 but I thought we needed to over prop a little on the arnesons - maybe go 25 but in a smaller diameter and with 4 blades or more if I can find them?

I'll send you another email so you have mine - keep in touch Dude and keep me appraised of your progress on the "turd" - too funy
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