mach1magnum

what hp and speeds are you running?

Meara_Image

Looks like it's alot of go-fast goodies...nice buy!
Hp around low 5's..maybe more? you got the carb spacer to the high rise intake.nice exhaust.Msd..
great lil motor!!
boat looks like it's flyn
Thanks for the Pic

n2ostroker

Details in post #17
Cruises in the mid 60's
WOT somewhere in the low-mid 90's. Never ran it all the way out.

mach1magnum

HOW ABOUT THIS ONE?




http://boston.craigslist.org/nos/boa/2943414979.html

Fenderjack

iTrader: (2)

I will post you a pic of the new small block motor for our stinger all parts ,crank rods,pistons cam lifters heads are new.Bock is used intake used m3 procharger used.All parts were bought of of oso or ebay were checked then used. Have less than 4 thousand in it a moderate 575 HP. JOHN SR

Meara_Image

Looking forward to it!

Uncle Dave

Very similar to mine- although you are claiming about 94 HP more using the same heads and intake with a slightly more agressive cam- you have a dyno sheet? (lf you are dry you can run a more agressive cam for sure with little worry about reversion)

True I could make more beans with a solid roller vs a hydraulic- I dont want to get into the top every 10-20 hours and start making valve adjustments anymore- too old for that crap. Also I thiiink at .630 (I see why you ran a shaft rocker system) of lift were into the springs not liking to sit while being compressed or they lose their rates.

Also curious what your oil cooler looks like- can you throw up a picture of that? I use an aeroquip- see on other side of battery.

Curious that you still have all the recirculating plumbing on the engine also how are you steering that boat- external?

Agreed on the SBC- Nothing like putting a BB boat "on the trailer" then showing him a small block.


Uncle Dave

Meara_Image

Uncle Dave- i like your style!

Uncle Dave

Thanks.

Your quest is one I am fond of and have undertaken many times.
Not my first rodeo.

- conversationally-

Mach1's got an interesting rig as well. I like it.

His 22 foot V runs the same speed as my 21ft tunnel hull with 94 hp more.

Hes giving up some HP to run his recirculation system.

Aside from added maintenance - and drive lifespan from shifting above idle (he didn't spec the duration or overlap that would determine idle quality) he can run as big a cam as he wants with dry exhaust which could be why hes making the power he claims.

Its also straight out vs an s bend like mine - but that manifold looks really short before the collectors come into that collar piece- looks like a gen1 stainless marine setup.

Ill bet that sounds beautiful at 6200 RPM - Id probably get a ticket if I had a similar system.

I stop spinning mine at 6

He gets more speed help from the drive than you or I do.

1. The alpha is a really hydrodynamically efficient (skinny) drive, and very easy to turn from a parasitic loss perpective - but they are weak, and were rarely paired from Mercury with big blocks for this reason. But when pushed in only one direction they can hold up for a while- if used offshore you're lights out pretty quick.
2. His boats pretty light which helps it live a bit.

Im paying at least 2-3MPH penalty for the speedmaster lower (I much prefer the imco on my other boat) and another 2-3 MPH for the bravos fat gear case to "tax" my mills output to the prop.

Back to cooling- with the recirc pump off and the external oil cooler I've held the thing at 6K for a looong time and only ever saw 140 on the oil temp and 100 on water- so its really running cool.

-Thinkin out loud-

Uncle Dave

Meara_Image

preach!