Carbon Build up From Race Fuel - Heads Valve Seats
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Carbon Build up From Race Fuel - Heads Valve Seats

  1. #1
    149 BGJ-Willis Power 540 willis's Avatar
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    Default Carbon Build up From Race Fuel - Heads Valve Seats

    July 21, 2008

    Hello People

    Just wanted to know if anybody has problems running 120 Oct fuels with the heads?
    In particular the build up carbon on the valve seats causing leak down problems because the valves will not seat?

    Sunoco, VP, F & L Distributors - ST 118, Turco.

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    Cantard 71hallett's Avatar
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    I have seen this in a to rich situation. Carbon on the pistons aswell?
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member H20MOFO's Avatar
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    Default temp?

    oil temp ? Sounds too cold or too rich or both.
    Another Hot Boat refugee

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    Owner/Crew Chief 1/4 Miler's Avatar
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    Willis,

    Know your running a PSI Roots ... it would help to know your static compression ratio and the boost your putting to the motor ... assuming something like static 8.5 to 9.0 and your boosting something like above 20 + percent ... under 30, 120 Octane seems alot ... octane stilts ignition ... perhaps your running too high an Octane ... Have you run VP C16 (117) consistently enough to get a 'read' on how it does?

    Jak

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    149 BGJ-Willis Power 540 willis's Avatar
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    July 23, 2008

    Jak,

    What I did was change fuels from C-16 to Turco stuff and its 120 Oct.

    Ran one race and checked the leakdown.

    The numbers coming back indicated that there was something wrong in the heads.

    I took the engine apart and the build up of carbon looked like a sponge on the valve seat and where it seals.

    There was only one change and it was the fuel. VP didnot leave that kind of carbon in the chambers.

    That race was a test run on the new fuel. The blower psi was 31lbs and static is 8 : 1.

    willis

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    Owner/Crew Chief 1/4 Miler's Avatar
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    Willis,

    Can't really be specific without actually seeing (being there) what you have going on ... can only give you some 'maybe's' .....

    Talked about it a bit with Mike and:

    C 16 has a spec. gravity of 0.735 ... Assume you used Torco 118 (MON 120) 'Orange' ... it has a spec. grgaity of 0.710 ....... this means to stay @ the same mixture of a/f you would have had to increase the amount of Torco in the cylinders by minimually 3.4 % ... if you did, fine ... if not, you were leaner ... How did the plugs look? If they looked on the normal to lean side, then you were lean and what your seeing on the valve seats may in fact not be carbon, but, aluminium (piston material/head) due to being lean and higher heat... if the plugs looked 'sooty'/rich then could well be carbon ..... ??? Can't tell 'from here'.

    Not seeing things first hand, I won't venture on the solution of using the Torco (things like taking timing out, increasing tha amount of fuel, etc.) ... what I, personally would do is say 'screw' the Torco and go back to the C 16 ... If it ain't broken, don't try and 'fix' it ... just me.

    Sorry, can't be of more help without being there.

    Jak
    Last edited by 1/4 Miler; 07-24-2008 at 04:30 PM.

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    Driver 78CoLeBBF's Avatar
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    the last race i hit the ground when that boat was running it shoot the ducky of ming for the fast boats to run

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    149 BGJ-Willis Power 540 willis's Avatar
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    July 25, 2008

    Jak.

    I started cleaning up the short block for reassembly of the heads, and notice that there is a large residue of black soot.

    71 Hallet was correct it was exstremly rich.

    Just didn’t want to have another set of piston half melted.


    78 Cole, you are correct for the June Race, now lets see how you do with my boat.

    See Ya out there

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    Cantard 71hallett's Avatar
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    Start pullin a little fuel bit by bit and watch that thing come alive. That rich almost seems to shove fuel deep in the plug making it load down like your at the end of your power. Baby steps are key. What carb are you using?
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    Also be carefull running the orange torco, it will start to close up your jets if it sits any amount of time.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    149 BGJ-Willis Power 540 willis's Avatar
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    No Carbs - injection - old school Enderle and psi blower


    We

    made sure that that the enginge was fat.

    With all the other issues that were found, we did not burn the thing up.

    That ST 120 Stuff distributed from F & L fuels of Long Beach, CA is what we are going to try.

    It looks just like the Turco 118 and has the same properties.

    Thanks

    Willis

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    Driver 78CoLeBBF's Avatar
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    hey wiilis if i had the money i would of bought blade runner and had a good time with all the blown gas jets

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    149 BGJ-Willis Power 540 willis's Avatar
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    Quote Originally Posted by 78CoLeBBF View Post
    hey wiilis if i had the money i would of bought blade runner and had a good time with all the blown gas jets


    Jeremy,
    You should stick to side line observations.

    It's a better suit for you.
    Last edited by willis; 07-28-2008 at 07:57 AM.

  16. #14
    Senior Member bp298's Avatar
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    that's a pretty big jump in s/g, as well as a lot of other fuel specs that are not easy to obtain. why change from what you were running?

    if i were you (of course i'm not), i'd haul the entire fuel system to a certain shop in havasu, and get it all tuned up for the fuel you intend to run. and if ya need directions, i'll lead ya there and take you in the front door

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