Causes of tight wrist pins and scuffed pistons ?
#13
28 degrees is a baseline starting point depending on many variables , i would say that 30 to 32 degrees is where you'll end up, but be cautious as the pistons you're using aren't "my" first choice lol
True blower pistons are designed to withstand the higher temps associated with blower engines, I'll call you and we can discuss this in greater detail...
True blower pistons are designed to withstand the higher temps associated with blower engines, I'll call you and we can discuss this in greater detail...
#17
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i remember when hawk was building those .they started out with a base 420 merc i belived they changed the cam and bolted on the b&m blower .they had a lot of problems ,dentonation!!! i have a question did the motor set for a long time? any heat signs of heat on the bottom of piston under the dome?
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fixx
reason for asking,i had a customer that scuffed all the outside's of his pistons..he sucked up sand and all the sediment would not allow the water flow properly and the cylinder wall expanded and did the same thing your did..sea strainers cured his problem after a bore and a set of pistons..
#19
Thanks fix, I have monster strainers, and there is no sediment I can find in the block.
I think mike and joe may be on to something.
I think the pistons were just too tight for the application. I know the pistons aren't designed specifically for a blower, and I don't want to put a bunch of $$ into these 454's right now. I plan on building a pair of 540's in a year or 2, so to put $1500 worth of pistons in these to only use for a short time just doesn't make a lot of sense. ESP when I have 2 sets of these pistons for short money. I'll get the bores measured up and see where they are at.
I think mike and joe may be on to something.
I think the pistons were just too tight for the application. I know the pistons aren't designed specifically for a blower, and I don't want to put a bunch of $$ into these 454's right now. I plan on building a pair of 540's in a year or 2, so to put $1500 worth of pistons in these to only use for a short time just doesn't make a lot of sense. ESP when I have 2 sets of these pistons for short money. I'll get the bores measured up and see where they are at.
#20
The hawk decal on the blower said 26* max but these were originally built in the early days of supercharging pleasure boats.
The bottom of the domes look fine, no excessive heat in the tops of the pistons.
I know I sound like a cheap a$$ but just got married in may and I'm buying another house now, had to pay off both trucks, and any cc's to get approved. Money is tight right now. I sold my old blowers and bravo crap and that equalled enough to buy the 420's.
Do you guys think these will live if I open the bores to .0065? Guys are putting decent size whipples on otherwise stock 500efi's and doing ok right?
The bottom of the domes look fine, no excessive heat in the tops of the pistons.
I know I sound like a cheap a$$ but just got married in may and I'm buying another house now, had to pay off both trucks, and any cc's to get approved. Money is tight right now. I sold my old blowers and bravo crap and that equalled enough to buy the 420's.
Do you guys think these will live if I open the bores to .0065? Guys are putting decent size whipples on otherwise stock 500efi's and doing ok right?