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About LinkBacksWhat size engine,(BBC),540,555,565,572,etc,etc. would give the most power/reliability in relation to cost for a blown v-drive cruiser ?
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What size engine,(BBC),540,555,565,572,etc,etc. would give the most power/reliability in relation to cost for a blown v-drive cruiser ?
572........with that said...we're building a 588Originally Posted by VD Cruiser
Formally know as UNFORGIVEN...
I would go 540 so to save the block for rebuilds! But, as I was always told there is no replacement for displacement! Bigger cubic inch will most allways give you more power!
SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
WT
WFL Crew!!!
I was unaware that a 572 used up more block than a 540. Um, learn something new everyday.
Id build the 572. But then, thats just me.
I was thinking with the same stroke and rod combo! My Bad!
SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
WT
WFL Crew!!!
557. Tell them Bob.
What's your intended usage and RPM range you plan to run?
Hauling ass at redline. DUH!
Why else would someone build a blown 540 (OR BIGGER!!!!)
Yeah,, but is he racing GN, wanting to turn 7500 RPM,, or just playing with the boat at 5500RPM ? Don't you agree that that would affect choice?Hauling ass at redline. DUH!
Why else would someone build a blown 540 (OR BIGGER!!!!
Why do you like the 1/2" stroke over the 1/4", and what RPM would you suggest for "reliability"?
I don't know why? I guess because every blown 572 I have ever seen would bury a 540. Maybe its a cubic inch thing. Just a guess. I have always been a fan of stroke with a blower. If he was racing it I would still go with the 572. Possibly even a 632. I am thinking there is a reason almost all class racing seems to have limits on CID. Must have something to do with HP. Just a guess.
So 60 HP will "bury" the other guy?
Thanks for the suggestions so far, I knew I would need to elaborate more. I currently run a 548 with a 10:71 and 2 1050's and Canfield 350 heads. Its a pump gas/110LL deal and runs 11/12 lbs boost with 48 gears in the v-drive. With a 11 3/4 X 16 2 blade Menkens it turns 6300 on a good day. I recently changed from a flat tappet to a roller, but I didn't see any improvement in top end, maybe a little better acceleration. The max rpm I would hope for is 6500/6800. The boat is a 21' Howard. I'm very happy with it now, but this engine has a lot of time on it and I 'm thinking ahead. Oh, its not a race boat, just a river deal and I'm trying to keep up with the jets and whackers in this area.
Chief seem to like the 572" as well!
Marine Engines - Hi Performance - Powerboat - Chief Engines
Sterling uses a 557 for their 1500's and some 600"+ in some of their other offerings. Only a guess but I'm thinking once you get into the 632"+ realm the piston speeds get pretty high and friction losses start weighing on the overall gains as well as the additional cost for clearancing the block. A 572 will give you a nice big motor with plenty of cylinder wall thickness in the event there is an issue or for when its time to freshen up.
I would like to hear more opinions on why the big name guys who charge big $$$ don't use more cubes? My piston speed / friction loss statement came straight from my rear!
Unless I am wrong, isn't Chief more known for engines for bigger boats? That was part of the reason for my original question. I think the longer stroke engines are happier at lower RPM, so I would not normally be thinking of a 4.500" stroke for something running 6500 RPM
Next question I would have is how fast is the boat actually running at 6300 with that gear and prop,, must be pretty darn quick?
Maybe there is somewhere else besides the engine to increase efficiency if you aren't already stopping those other guys?
Last edited by obnoxious001; 11-17-2011 at 01:05 PM.
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