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Author Topic:   Alcohol Question
kcoutlaw
Member
posted August 26, 2004 10:42 AM
i hope this well help im tecking for mod70 and he has the same problem kinda he is getting very milky but i found that he is not running hot so here we go if your hot your probly a little rich the only way i can tell you is ill need a little more info to be sure so if you want drop me a line and give me more details so i can try to help more acurately.
hotrod


mod70
unregistered
posted August 28, 2004 10:52 PM           
kc - like sick said, my oil is milky from alky too. We're trying to track down the carb problem, but from what I understand running fat with alky should keep the temps down because the alky acts as a coolant. 16 to 18 gal is high for 25 laps. Did the problem start by itself, or has it been there from the first time you started running this motor?


kcoutlaw
Member
posted August 29, 2004 10:06 AM
KP uses the style metering block that uses the large jets with alky. I'm sure he can tell you the difference.


Sick&Twisted
Member
posted August 29, 2004 08:32 PM
in responce to the driver useing 155s in his engine you drop a different set of heads and intake and your jets would be to fat to run rite thank bagees that it works for you. To be perfect on a set up we will need air flow #s and lift #s from your cam and lob seperation specks and we can make it run like a clock on the juice.
hotrod

[This message has been edited by Sick&Twisted (edited August 29, 2004).]

mod70
unregistered
posted August 29, 2004 10:57 PM           
Just checked my seconds and they are 99's also. Carb is a Barry Grant Built. I found that my primary needle was hung wide open because of a bit of rubber from a gasket was stuck in it. Can't wait till tommorow to find out if I've got it fixed. Good luck with yours.


Xtrem4U
Member
posted August 30, 2004 06:24 AM
OK, firstly, jet #'s that are in the 140's or higher are because they are the 5/16" HP series alky jets.
Jet numbers that are in the high 90's, are always going to be the standard sized 1/4" gas jets and are used in older style metering blocks where the builder has drilled auxiliary holes either above or along side the jet holes. This is not done anymore, by most builders since we all use the HP metering blocks with big alky jets (140's or higher).

Now, as for the excessive fuel use. Assuming there is good ring seal (alky will wash down cyl's and ruin ring seal), then the only way THAT much alky gets into the oil is because it's FAR too rich. Overly rich conditions will not only wash down the cyl walls and contaminate the oil, but it'll get past valve guides and seals as well.
Higher engine temps with extreme rich conditions can be due to all that extra fuel still burning while it's going out the exhaust (backfiring and flames, like you have), and it also could be a timing issue with the ignition.
Normally, trying to read plugs with alky is tougher than with gas because alky burns so clean compared to gas unless it's got additives in it such as top end lube, for example. Things like that will leave deposits that are "readable".

I'd be interested in hearing some more specifics about what you've got in the carb now (jet, PV, etc), what timing, some head/intake/cam info, and we should be able to remedy the situation.

Hope that helps,
KP


Xtrem4U
Member
posted August 30, 2004 07:14 AM
MY problem was the floats setting on my belt drive fuel pump i was setting the floats at 2pd on idle half way on the big sight glass had a miss and never could find out way then i throttle the car up one day and i notice the floats were full at around 5pds pressure back the floats down to around half way on the sight glass at 6pds and that did the trick i guess it was the volume of the belt drive pump i also run 8pds at wide open but i also wanted to change the jets but i knew the motor was not over jetted but it showed too much on the plug


kcoutlaw
Member
posted August 30, 2004 03:56 PM
Thanks for the info everyone,
Chomme, That's a thought, you're right about the pump and the bypass.
KP, I'll get you the info as requested.
Thanks, kc


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