r.p.m moderation policy
Owwww, look what you posted trolling poor old granny Carol...... are you a |
=?iso-8859-1?Q...
Jan 10
|
| I've seen big blocks in smaller boats than that. |
Tim
Jan 12
|
| Might be better to pop a 383 stroker in the boat. Same motor mounts, almost
as much power as the bigger motor and lighter weight. |
Calif
Jan 12
|
| If I give it WOT the skier gets his arms pulled off if he does not let go.
Way lots of pulling power at low speed. |
Calif
Jan 12
|
| It actually depends on the size of the boat and engine, as well as the
weight of the skier. |
JimH
Jan 12
|
| I run a V8 3400# boat with a low pressure pump. Designed to give lots of
push for running rivers. Actually saw the same thing with the Olds 455 in a
Tahiti lo-profile Berkeley pump in the 70's. |
Calif
Jan 12
|
| I can now understand your need to watch the throttle when pulling a
water-skier, especially during the initial pull out of the water. What is the pitch on your prop? |
JimH
Jan 12
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| I have a hard time getting up on the ski when the wife is driving. Just
gives it WOT. |
Calif
Jan 12
|
| But is ohh so Boring. Give me the firewall or give me death! The motor is built for 4500RPM (SB Chevy) and while I could cruise at
3400. There are many times that it's much more fun to run over 4000 and
even at 4500.
I can't anymore than blow it up. And then have to rebuild a new ...
Anyone see any problems with putting a Big Block in a 21' SeaRay? |
jonett6
Jan 12
|
| And for me, especially when pulling a skier. |
osudad
Jan 11
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|
Using moderated rpm, as opposed to WOT, extends range as well as engine
life |
Chuck
Jan 10
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| I rarely ever run my 3.0 in my boat more than 3500 rpm. it will crank
up to 4200, but i usually get up to planing speed, and a little bit
over. I never could really see beating up the engine, with little speed
increase, and use a lot mroe fuel. |
Tim
Jan 10
|
| I don't even run WOT to get up on plane. Just ease the throttle
forward and let the engine push the boat up. Amazing how much gas you save that way. |
Short
Jan 11
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| Absolutely, but do the watchers think you're a 'manly man'?
-- ***** Have a super day! ***** John H |
JohnH
Jan 11
|
| Probably not, but then again, who cares? |
Short
Jan 11
|
| I nail it to come up out of the hole, because by trying to come up
slowly, the boat wants to plow a lot, so I figure hit it hard to get it
up on plane quickly then when the bow comes down, then back off the
throttle. Works best for me. |
Tim
Jan 11
|
| Some years ago, a mechanic told me to firewall the engine to get the
boat up on plane, and then ease off to cruise speed. I think he said it
was less strain on the engine, because the engine wasn't lugging. Or
something like that. |
Harry
Jan 11
|
| Could be a lot of truth about that, Harry.. I don't know about a 2-stroke, but a 4-stroke, that would make a bit
better sense, especially seeing that on launch, the oil in the crank
case is thrown to the back of the engine, and , depending on how the
oil pan is set up, can at least momentarily starve the engine fo
lubrication. I'm not really sure of teh idea of lugging the engine,
seeing the prop would provide plenty of slippage so I can't see that
the engine would be really under that much stress, but then again |
Tim
Jan 11
|
| I've read there's some controversy regarding piston aircraft engines,
whether to use full throttle for takeoff or to use somewhat reduced
power to lower stresses on the engines. They say the pistons will extend
very slightly further down the bore at full rated power, I suppose due
to bearing clearances, stretching, thermal expansion, etc and that if
you never run at full power the ridge worn in the cylinder over time
will be lower down and can break rings if you do then go WOT. I'm not
sure if this is an issue with boat engines but they're run under similar
conditions. |
James
Jan 11
|
| Me too! If everything is set up correctly, you can run all day long at
wot. |
basskisser
Jan 11
|
