How to start a 327 SBC? - Page 3
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  1. #21
    Turbo 4 pot freak 20vT_pop's Avatar
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    Hi Mark i'm not a V8 specialist by a long way but unless you are using a full race cam with massive overlap I would of expected compression pressures in the 120 to 175 psi ranges 80 sounds like the engine is turning over to slowly or you aren't holding the throttle open fully to let the air in when cranking.

    Also if you are using a dual point distributor it's easy to time the dizzy up the the wrong cam lobe heel, and a lot of people time the dizzy up statically to the wrong side of the dizzy cam lobe i.e thinking the dizzy shaft turns the wrong way hence setting the opening up well after the correct time, often when they are set this way they don't even cough and spit. If as you say you are a novice builder it is probably only one of these stupidly small detail things that aren't quite right.

    Hope there is a little bit of info here that may help, if you are using hydraulic tappets you have to have a very gentle feel when feeling for the initial contact of the push rods to lifter cup and rocker arm seat. I always very gently hold the push rod very lightly between thumb and forefinger lifting it up and down a few thou and rotating it gently to feel the initial friction you get when the clearance is just taken up, then if my memoryserves me correctly you then give the adjuster a 1/4 or 1/2 turn (depending on manufacturer) of pre load. You don't normally get a lot of compression on the lifter cup so you can easily over adjust the initial setting when the lifters are empty.

    Hope you don't think i'm sticking my 4 cylinder nose into your problem but I think an engine is an engine.

    Good luck John
    My Pop Build thread https://www.rodsnsods.co.uk/forum/gar...op-build-32191
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  3. #22
    Full Bloody Rebel! Mad Mark's Avatar
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    Yer right John!

    I have just tried it again and it tried to start, then went back to grinding. Has anyone local got another carb and coil I can try? I just want to eliminate the coil from the equation.
    If I wasn't meant to go that fast, the pedal would only go half way!
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  4. #23
    Official RnS Addict beach57's Avatar
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    If you through some gas down the carb it should fire ,if its a carb fault if not go after the coil but to me the comp is not high ,did you pump the lifters with oil first using an oil can.
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  6. #24
    Exceeded sell by date Plumpcars's Avatar
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    I don't like pre lubing lifters but I do make sure that they are set 100% accurately. I suspect a lifter or ignition timing issue.
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  7. #25
    Full Bloody Rebel! Mad Mark's Avatar
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    I ran the oil pump with an electric drill to pre-oil the engine as I didn't want more problems. I also tried some Eezy start, but it didn't even fire lightly. I cannot believe it won't run and I'm sure it is coil or carb. I am bloody sure the engine is properly timed (I am a mechanical engineer by trade....) and fuel is up to the carb, sparks are there with the plug out of the engine. I also re-set the rockers to get rid of lash and then added only 1/4 turn.

    This is doing my nut!
    If I wasn't meant to go that fast, the pedal would only go half way!
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  8. #26
    Administrator blackpopracing's Avatar
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    I agree about the compression, I would have expected about 180 psi.
    A quick check for TDC is set the motor at TDC and poke a pencil (not a pen) gently into the plug hole against the piston top and rock the engine with a spanner on the crank nose to check piston is at TDC when marks show it to be. You can feel the piston push the pencil up and down (hold it very gently and pull it out of the plug hole as the piston pushes).
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  9. #27
    Official RnS Addict beach57's Avatar
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    Are there not 2 sets of timing marks for a 350 sbc ?
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  10. #28
    Rods 'n' Sods Junkie newboldspeed's Avatar
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    Try a new set of plugs gap 35 thou.........THE PLUGS COULD BE WET FOULED..WITH THE AMOUNT OF CRANKING YOU HAVE DONE......
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  11. #29
    Exceeded sell by date Plumpcars's Avatar
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    And while you're at it lose the Champions Mark. Used to be a great plug but quality seems to have dropped.
    If the carb is squirting then thats good enough for the engine to catch so I doubt the carb will stop it trying to start.
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  12. #30
    Official RnS Addict MYTHING's Avatar
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    Just my foupence worth

    A method I have used to start engines that have been stood for years and wont even pop or try

    Make sure you are happy that the engine should start...fuel, spark, timing valves

    Remove all spark plugs and clean them, heat 4 on the gas and fit to alternate cylinders

    Make sure you are in a ventilated area and have a fire extinguisher, spin it over ( it will now spin much faster) and it should start

    Good luck and post what it turned out to be
    IT'S NOT GETTING WHAT YOU WANT...IT'S WANTING WHAT YOUVE GOT
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