blown alcohol wrist pins
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blown alcohol wrist pins

  1. #1
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    Default blown alcohol wrist pins

    I have a blown alky bbc with 1.094 wrist pins but its coming time to put rods and pistons in it im thinking about going with the .990 wrist pin set up its a easier piston to get and a good bit cheaper how much power will the .990 wrist pin take. A custom set of pistons for the 1.094 wrist pin start at 1200.00

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    Village Idiot fc-Pilot's Avatar
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    Call Venolia. Is that for a set of twelve?

    Paul

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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by matt wheeler View Post
    I have a blown alky bbc with 1.094 wrist pins but its coming time to put rods and pistons in it im thinking about going with the .990 wrist pin set up its a easier piston to get and a good bit cheaper how much power will the .990 wrist pin take. A custom set of pistons for the 1.094 wrist pin start at 1200.00
    $1200 is about right for a custom set of 8. Our last set was $1600 for 10, coated & gas ported for a BA application. Not sure a .990 pin would be much cheaper unless you found a set of "off the shelf" pistons. I never found any that would work. A broken wrist pin is one of the worst engine failures you can have, so I wouldn't go to light on them...
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    ....... David 519 is 100% correct........

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    Quote Originally Posted by David 519 View Post
    $1200 is about right for a custom set of 8. Our last set was $1600 for 10, coated & gas ported for a BA application. Not sure a .990 pin would be much cheaper unless you found a set of "off the shelf" pistons. I never found any that would work. A broken wrist pin is one of the worst engine failures you can have, so I wouldn't go to light on them...
    X2 on the THICK pins , I am using .990 pins but they are the ferria .250 wall tapered pin's ,,,, have had good luck with them ,,,,,,,......E

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    i'm back!! 1QuickCP's Avatar
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    I would not run a .990 pin in a blown alcohol deal,
    now if ur just runing like 25 psi or something you probably be ok with .990 .250 wall. But really if ur building a serious BA motor big pins r the way to go.

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    Default wrist pins

    Well i will probably just go back with what i have then i havent had any trouble with this set up at all, im running venolia pistons with fowler rods tall deck bbc with a 3.76 stroke, 30 over 427 and a 6.535 rod it runs great. Times a tough right now hard to fork out 2500 right now but i can just see having to do it twice if i dont go back with what i know works. thanks alot guys just need a little talking into something every now and then

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    I always used C&A 185 gram taper walls. I always ran a shelf TRW or Manley Pro dome piston. Never a problem.
    Then I happened to build a "backup" motor. Had a new set of Trw pistons....but money was tight....I'd just run the TRW pins for "now"......later I was gonna go back in and do a set of C&A taper walls.
    I never got the later.
    She made one pass. One pin let go in the lights. All we found were "chrome looking shavings."
    But I didn't have to worry bout a backup motor after that cuz there was not much saveable.
    LOL

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    A connecting rod, tied down only by the big end, can be a very ugly thing. Just never seems to have a nice ending.



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    Default wrist pin

    Im also running the buttons i dont really see the need in those they are cool for a quick pistons changer if you melt one but thats also damn expensive to have done im going to go back with the spirolocs

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    Default pistons

    Also guys what do you guys think about 12to1 compression i have always heard thats a good blown alcohol motor and it has been but im thinking about going with a little less compression and alittle more boost i wont get over 25psi to run 8s in my hondo runner bottom sorry for all the questions i just know you guys know alot more about it than i do i have been building motors for awhile now but i dont know as much as some of you but i think im doing alright for 23 year old guy i havent throwen the rods out of my blower motor yet but i know its coming

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    Default blower

    I have also upgraded my blower some went from a 871 mooneyham to a 1471 mooneyham im running a summer brother front drive set up this stuff here is all new to me but looks like its going to work out well

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    Senior Member wagspe208's Avatar
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    Big pins are not necessary in anything but a real competetive BA deal. (30+ boost)
    .990's are run day in and day out in pro mod engines.
    12.1 to 1 is a little high. Easy enough to slow down the blower, though. You better have port nozzles to tune cylinders.
    Go with a shelf piston if you can. They are cheaper, and faster to replace if one is damaged. I'd sacrifice some compression for a shelf piston if I had to (especially with a 14-71 on a 427) (I actually did on a 492. I only have 10.5 on the pe boat. I'd prefer 11.5 to 11.7 but shelf piston thing again)
    Good luck.
    Wags

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    Default boat

    Hey wags your old boat went to walter dulin right, i hope he didnt screw you around to bad he lives right by me he is a hated guy around here

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