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[quote=”EricTheCarGuy” post=110460] I recommend replacement over rebuild for best results.
Good luck and keep us posted.[/quote]
I think we have two worthwhile machine shops left in my area that service/refinish blocks & heads (if you’ve got a good core to work with). Rebuilding an engine is almost a thing of the past with crate engines so readily available.
Many years ago I adopted a nerdy pocket protector just because a tech put a pen thru a car seat. One of my tech friends always takes off his belt before doing anything in the shop. The best bet by far is an empty pocket.
Remove your jewelery too. I know of a guy who lost a finger by jumping of the running board of a parked semi…
Many years ago I adopted a nerdy pocket protector just because a tech put a pen thru a car seat. One of my tech friends always takes off his belt before doing anything in the shop. The best bet by far is an empty pocket.
Remove your jewelery too. I know of a guy who lost a finger by jumping of the running board of a parked semi…
[quote=”a88racefan” post=106396]It is a Merc Cruiser and I told him before I left to check the power valve not sure if it’s a holley. It doesn’t have a mag just a standard electronic distributor which he put in new rotor plugs and wires[/quote]
I did a quick google on Merc Cruiser, and it was all over the map where carburetors are concerned. Seems Merc used every carb known to man.
That said, since it’s a boat there is a very good chance the fuel is contaminated (and I have doubts about 10% methanol too).
[quote=”a88racefan” post=106396]It is a Merc Cruiser and I told him before I left to check the power valve not sure if it’s a holley. It doesn’t have a mag just a standard electronic distributor which he put in new rotor plugs and wires[/quote]
I did a quick google on Merc Cruiser, and it was all over the map where carburetors are concerned. Seems Merc used every carb known to man.
That said, since it’s a boat there is a very good chance the fuel is contaminated (and I have doubts about 10% methanol too).
Where Merc Cruiser is concerned I can only guess as to the timing/advance curve they use, however, any BB Chevy will respond well with 35 to 40 degrees total advance @3,000 revs.
Your friend should look at the secondary side of his carb. I’d bet it’s a Holley, and I’d bet the vacuum dash pot controlling the secondaries is blown along with the power valve. Holley carburetors are known to suffer this kind of damage from a back fire.
I’d bet when your friend advances the throttle to wide open, that’s exactly whats he is getting -WOT (in short the secondaries slam open creating a lean bog). They should open gradually as engine demand dictates. A mechanical double pumper carb compensates for the lean bog with the second accelerator pump, but not so for the vacuum secondary carb without metering rods like Holley.Where Merc Cruiser is concerned I can only guess as to the timing/advance curve they use, however, any BB Chevy will respond well with 35 to 40 degrees total advance @3,000 revs.
Your friend should look at the secondary side of his carb. I’d bet it’s a Holley, and I’d bet the vacuum dash pot controlling the secondaries is blown along with the power valve. Holley carburetors are known to suffer this kind of damage from a back fire.
I’d bet when your friend advances the throttle to wide open, that’s exactly whats he is getting -WOT (in short the secondaries slam open creating a lean bog). They should open gradually as engine demand dictates. A mechanical double pumper carb compensates for the lean bog with the second accelerator pump, but not so for the vacuum secondary carb without metering rods like Holley.Don’t overlook pawn shops. I’ve seen $7500 boxes come in and they’re only asking $3000. I know that sounds terrible, but these were big Snap-On boxes in good shape.
I’d take one of these over any new bargain box in the $1500 -$2000 range…Don’t overlook pawn shops. I’ve seen $7500 boxes come in and they’re only asking $3000. I know that sounds terrible, but these were big Snap-On boxes in good shape.
I’d take one of these over any new bargain box in the $1500 -$2000 range…It sounds like a fuel problem to me too. At 3,000 revs full advance has occurred, typically, and there is more than ample siginal to pull fuel from the secondaries regardless of cam choice. I’m thinking this thing has a Holley carb with a bad power valve. I’d also bet it’s running rich and stumbles a fraction of a second after the throttle is advanced to wide open. If this has a magneto or some other type of point set triggered ignition, look there first. That’s my best guess…
P.S. Is this a Mrec Cruiser?
It sounds like a fuel problem to me too. At 3,000 revs full advance has occurred, typically, and there is more than ample siginal to pull fuel from the secondaries regardless of cam choice. I’m thinking this thing has a Holley carb with a bad power valve. I’d also bet it’s running rich and stumbles a fraction of a second after the throttle is advanced to wide open. If this has a magneto or some other type of point set triggered ignition, look there first. That’s my best guess…
P.S. Is this a Mrec Cruiser?
IMHO Toyota is without question #1 and has been for more than 35 years. Honda’s Accord & Prelude have been right up there too, but don’t quite have the track record that Toyota does.
Another great choice is Subaru. They are quirky, like an old Saab, but offer all wheel drive. I’m not a Nissan fan and don’t think they’ve offered much since the old 300Z…IMHO Toyota is without question #1 and has been for more than 35 years. Honda’s Accord & Prelude have been right up there too, but don’t quite have the track record that Toyota does.
Another great choice is Subaru. They are quirky, like an old Saab, but offer all wheel drive. I’m not a Nissan fan and don’t think they’ve offered much since the old 300Z…