Update on 216 to 261 engine switch

[Bob Carriere]

Hi Phil

That can't be right....... lifters should not leak down that easy or that fast..... unless the oil pressrue is tooo slow building up on start up.

My experience with Chev 6 goes back to the fifties.... all on 235 in cars with hydraulic lifters..... and even after parking the 58 chev for the Winter.... it never made a racket when staretd in the Spring... it might some a little from the oil in the cylinders but never noisy....... you might hear a clacking of valves for a few seconds.......but never more than that.....

Are you sure you didn't rebuild a diesel......????

Barry "Cherchez la femme" might have more practical experience with them...

Must be a lot of others running 235 with long shut down......

BooB

[Phil Waterman]

Hi Bob

Well maybe cement mixer is a little harsh, maybe a sewing machine, but with the engine sitting out in the open with no fan it sounds loud (fan is electric on the test stand right now). Just after letting the engine sit for 3 or 4 days the first time I started the engine the top end sounded like a 216 with really loose valves adjusters. Of course once the engine built oil pressure (you right a couple of seconds) the noise went away.

The leak down may have been helped by the fact that I'd left the block heater turned on so the engine sat over the weekend at 100 F which would have kept the oil thin. I'll repeat the experiment and see if it happens again.

The oil pressure cold or hot is holding very steady at just about 40 psi regardless of engine speed. With the engine run in a little now I can let it idle down to under 400 rpm with no problem, still limiting top rpm to 1500 and not for any length of time. When I'm running the engine I keep changing the rpm up and down every minute or so.

Cheers Phil