Olds 455 motor
Decided to surprise my dad and spruce up the engine in our Sleekcraft jet boat. Did the heads (which were cracked) and on our test run we spun a bearing. Rebuilt the botton end (with oil restrictors this time) and after 3 days on the lake we spun all the bearings.
We're rebuilding it again with a new crank and I just bought a 10qt marine oil pan, are there any other suggestions so I don't have to rebuild this thing agian?
Set the brng. clearances loose..mine are .003 rods and mains..on a 10 10 crank...a little tighter
Originally Posted by MarkEarhart
on the rods would be better...mine is a converted car motor..std. bore....
marine head gaskets fix the problem olds has with the 4 center cylinders
running cold and wrecking piston skirts...
I run a 10qt. jet pan..and it's in a v-drive..high volume pump..no restricters...it seems to 'like' 8qts in the pan..less or more and the oil pressure gets a little flaky....
I drilled the drain backs in the heads... a lot....and last trip out i took a junk valve cover, stuck a 3/4 ths pipe fitting in the bottom corner and plumbed a piece of clear hose into one of the oil pan drains...i ran it plenty hard and i think i saw a little oil in the hose..one time.....
I run mine plenty hard..although v-drive i a little harder to load the motor
like a jet does..even with the 40 gears i run....5K red line is about max..although i have spun mine 5400 a few times...
And if ya want to short cut it..my motor is for sale..has maybe 25 hours,
if it was going to break, it would have done it already...runs very well...has K heads, tunnel ram 2 660 holleys...it come with everything..ignition starter alternator, dry bassets everything that won't fit a chevy..i bought the olds for my hydro...i figured less horsepower would keep me out of trouble while i learned to drive it..and it has...now it's time for a chevy..there are a few pics on my screen name
Thanks for the advice!
Not ready to scrap the engine we have...but I'm getting close.
I would take out the restrictors, run the hi vol pump and full grooved main bearings. Give it .018-.020 side clearance on the rods and have the crank ground .001 under the low side. 20/50 oil . Never keep it over 4500 RPM for long periods - short bursts only.
consider a different motor, sorry but thousands spent fixing a olds have led many here to still swap out, if your going for performance at all switch it out!
its just cheaper and less frustrating in the long run