olds tunnel ram help
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olds tunnel ram help

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    Senior Member glastornjet73's Avatar
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    Default olds tunnel ram help

    i know i kinda had a post like this before but i ended up buying an offey single carb T/R for my olds and advice for setup and tune? i know i was told that the T/R will not like a stock flywheel i have a 9lb flexplate and lightweight ballancer... i was told that i will need to go with a 50cc acc pump i have also been told i will need to go with bigger squirters and was told to start with # 50's.......will a non double pump vac 2nd work with the T/R or will i need the double pump to make it work? any other advice will be greatly appreciated!! thanks a ton dj

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    Senior Member rogerroost's Avatar
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    from everything I've read on here a single on a tr is trouble to start with. pretty sure theres no such thing as a dp vac carb,could be wrong though.

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    Cas
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    don't skimp on the carb especially on a single carbed TR. Here's a pic of a burned piston on the number 7 cylinder on an Olds-


    The 4 corner cylinders are going to be leaner with a single carb. Personally, I wouldn't run a single....not worth the possible failures that may happen.
    Last edited by Cas; 06-10-2010 at 06:58 PM.

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    Senior Member glastornjet73's Avatar
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    i have a very nice 780 street avenger that has been modified chork horn gone blocks modified and WOT passes are very limited in time not much more than 1/4 to 1/3 mile i have it jetted up 3 sizes from stock rite now and it is running good all the plugs look the same and i do plan on doing a 50cc pump and # 50 squirters rite off the bat

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    Senior Member glastornjet73's Avatar
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    Quote Originally Posted by rogerroost View Post
    from everything I've read on here a single on a tr is trouble to start with. pretty sure theres no such thing as a dp vac carb,could be wrong though.
    yeah i was meaning if i should go with a mech secondary sorry for the confusion

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by glastornjet73 View Post
    i know i kinda had a post like this before but i ended up buying an offey single carb T/R for my olds and advice for setup and tune? i know i was told that the T/R will not like a stock flywheel i have a 9lb flexplate and lightweight ballancer... i was told that i will need to go with a 50cc acc pump i have also been told i will need to go with bigger squirters and was told to start with # 50's.......will a non double pump vac 2nd work with the T/R or will i need the double pump to make it work? any other advice will be greatly appreciated!! thanks a ton dj
    I have never run a single tunnel on an olds before..but i am thinking that it wouldn't make sense for offy to build and market a manifold that had such poor mixture distribution as to cause damage to a motor...That said..i would think a 850 dp would be good guess for a carb...vacuum secondaries tend to open rather slow in order for the air to pull the fuel more evenly...as opposed to having acc pumps to cover the lean spot...and when in doubt,
    start it on the fat side, watch the plugs and back the jetting down a little at a time...and enough acc pump so it won't backfire...and you will need
    to put it in the water to find out...mine sounded fine on the trailer and ran
    really poor in the water.
    "A liberal paradise would be a place where everybody has
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    not, such a place does, indeed, exist: It's called prison."

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    Cas
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    Quote Originally Posted by Sold honda.bought hondo View Post
    I have never run a single tunnel on an olds before..but i am thinking that it wouldn't make sense for offy to build and market a manifold that had such poor mixture distribution as to cause damage to a motor.
    Offy and other manufacturers are geared toward the auto industry where the cruise speed is 1800 to 2200 rpms or so. A jet boat is cruising at least at 3000 and blasts for however long in the 5000 rpm range, something a car won't see very often, if at all.
    How many single carbed TR's have you seen at a drag strip, especially on an Olds?

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by Cas View Post
    Offy and other manufacturers are geared toward the auto industry where the cruise speed is 1800 to 2200 rpms or so. A jet boat is cruising at least at 3000 and blasts for however long in the 5000 rpm range, something a car won't see very often, if at all.
    How many single carbed TR's have you seen at a drag strip, especially on an Olds?
    Getting a tunnel to even work in the 1800-2200 rpm range can be a feat of magic....and a tunnel w/2 660 on a 455 would be a pig without 4.56 gears.
    tunnels don't start working until 3000.....and while i have not seen any actual hp numbers for a single 4bbl....a 2 4x setup is worth about 20hp @5k
    on an olds.

    I don't think the OP is looking for max performance...he wants the look...and it might take a bit of adjusting, it should work at least as as a low rise manifold
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

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    Senior Member glastornjet73's Avatar
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    Quote Originally Posted by Sold honda.bought hondo View Post
    I don't think the OP is looking for max performance...he wants the look...and it might take a bit of adjusting, it should work at least as as a low rise manifold
    i usually cruise at about 32-3500rpm the boat seems to be happy there @ about 38-40 mph depending on currents sometimes coming back fighting the current i will run 3800 i wasnt even planning on putting one on it but i was watchin one on ebay and with 30 min to go this morning it was still @ $232 so with 15 seconds to go it had not went up in price and i put in a pot shot bid of $250 and ill be damed if i didnt get it lol so i guess i will at least try it i just dont want to lose performance or destroy my engine i have a ton of money if it! and i seem to see a few i wouldent say quite a few but a few guys running mild engines with a single carb T/R.... i just have NO experiance tuning one nor does anyone i know i have came from a circle racing family and area do T/R's dont have no use around here until now lol

    so my biggest concern is destroying the engine grandpa is GREAT with holley's and if anyone can get it tuned it would be him and with the help from you guys i dont see performance beeing a problem i just kinda need a good starting point

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    Cas
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    I know he's not looking for max performance, at least that's what I gathered from the other thread. The thing is, a person can get just about anything to "work" but it's the how well that matters. Leaning out the 4 corner cylinders is not a good thing.
    There have been many people over the years that have had very bad things happen to there engines because of a single carb TR, just for the looks. Whether it's the wrong sized carb, poor tuning or other factors, the chance is there for bad results.
    It looks like a few people have put out the warning on the single carb deal so it won't be a shocker if something goes wrong. Many of us are just trying to help another person avoid a possible bad situation.

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    Senior Member glastornjet73's Avatar
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    if it comes down to it i will buy a new top and run two 450 or 500's u just want to keep my engine safe

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    Cas
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    Quote Originally Posted by glastornjet73 View Post
    if it comes down to it i will buy a new top and run two 450 or 500's u just want to keep my engine safe
    that would be a good thing to do
    I was like you btw. I had no intention on running a TR but couldn't pass up a deal that came across my bow.
    Everything you see in this pic for $250.00


    doesn't really look like that anymore though


    I've always loved the look so I'm pretty happy now

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    Senior Member glastornjet73's Avatar
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    yeah you stole that! i would have bailed those junk edelbrocks too i wouldnt use ANYTHING from edelbrock except an intake!!!

    idk i might get an 850 and try it once and watch the plugs CLOSE after all intake gaskets are cheap and i dont ever run my boat hard unless some drunk in a baja wants to start fu**ing with me then i will wax there a** for a few hundred yards and back to crusing speed i go lol there are times i take the boat out all weekend and it NEVER sees over 3800 rpm i baby my olds cause i know any time it is running i have a wick about >__________ <----that long lol and my engine is always cold like 140* cold so that will kinda keep piston burning to a min

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by glastornjet73 View Post
    yeah you stole that! i would have bailed those junk edelbrocks too i wouldnt use ANYTHING from edelbrock except an intake!!!

    idk i might get an 850 and try it once and watch the plugs CLOSE after all intake gaskets are cheap and i dont ever run my boat hard unless some drunk in a baja wants to start fu**ing with me then i will wax there a** for a few hundred yards and back to crusing speed i go lol there are times i take the boat out all weekend and it NEVER sees over 3800 rpm i baby my olds cause i know any time it is running i have a wick about >__________ <----that long lol and my engine is always cold like 140* cold so that will kinda keep piston burning to a min
    Ya...you have a handle on it....and keep gramps busy too! a
    And that 140 degree deal...i would consider that a minimum..water temp doesn't have much to do with burning a piston.....3800? that's a decent cruise rpm for me.....i do keep it below 5k...almost all the time...
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

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