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Gas or alcohol
Posted: Mon Oct 29, 2007 6:35 pm
by Eric Haynie
I have a Mc 91b1 how do I tell what it is set up to burn?
Re: Gas or alcohol
Posted: Mon Oct 29, 2007 7:32 pm
by Rob Voska
What carb?
Re: Gas or alcohol
Posted: Mon Oct 29, 2007 8:18 pm
by Eric Haynie
bdc 14
Re: Gas or alcohol
Posted: Mon Oct 29, 2007 11:12 pm
by Rob Voska
Unless it was modified....gas.
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 1:05 am
by Eric Haynie
modified how?
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 3:54 am
by Dean Seavers
drilling out the passages inside the carb to pass more fuel which is a requirement if you are going to run alky in those carbs. Gas carbs can't pull enough fuel through them to run alky, which requires nearly twice the volume. You probably won't know by looking at it if it's been modified or not. If you run gas and it runs way too rich, then you'll know it's been modified. Or you can disassemble the carb, ask on this board if anyone has a list of what the hole sizes should be and then measure them.
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 11:35 am
by Eric Haynie
Okay.....Which holes and what size?
Thanks guys
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 12:38 pm
by Eric Haynie
I just spoke w/ the original owner...My engine is Gas....Thanks for everyones help.
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 5:54 pm
by Jeff Campbell
... there is a page I set up several years ago that has the tech dimensions for the BDC gas carb... if it still meets the specs, it probably has not been modified for Alky and will run gas:
http://rearenginekarts.com/bdc-14.htm
Jeff
Re: Gas or alcohol
Posted: Tue Oct 30, 2007 8:05 pm
by steveohara
Hi Jeff,
Just a reminder.... dimension #2 on that page is incorrect and it should read .105"..... that thing would run pretty lean with the main fuel passage limited to .015"!!
Regards,
Steve O'Hara