Ron,
Are you using an Autolite 2100? What jet size in that two barrel?
My 4100 has 50 for primary jets. A 320 mile trip recently yielded 16.8 MPG.
Seeing how I am running on the primaries only during cruise, what is the
secret for getting 28 MPG? I am running 3800 RPM at 78 MPH. I have a 3.07
final drive. I also have a vacuum advance distributor.
I am looking for better mileage for my 1600 mile drive to Maine in Oct.
Thanks,
Duke
B382002037
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Ron Fraser
Sent: Monday, June 21, 2010 8:13 AM
To: 'Would U. Believe'; 'Tigers Den'
Subject: Re: [Tigers] Best Carburetor(s) for the Tiger
Carb choice depends on many factors; fuel pump is one. The stock
fuel pump will only support an engine around 200 HP. More HP requires more
fuel pump and more carb; ditto for more RPM's. All the carb charts I have
seen indicate that the SBF engine needs 420 cfm @ 6500 rpm; 250 cfm @4000
rpms.
The engine you built will have the best streetability with the 465
cfm carb. Carbs respond to vacuum signals; smaller carbs can have better
vacuum signal and better response at low speeds.
The 1.08 Autolite carb Duke mentioned would be a good choice too.
My stock 260 with a 300 cfm 2bbl has out performed many 4bbl setups
but much of that can be attributed to the guy and brains behind the wheel.
I can also get 28 mpg in cruise mode with the 4 sp.
I would suggest you install the 465 cfm or an Autolite first and
judge the results.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Would U. Believe
Sent: Sunday, June 20, 2010 8:17 PM
To: Tigers Den
Subject: [Tigers] Best Carburetor(s) for the Tiger
So, I'm wondering about carburetion. On my 260, per expert advice, I have a
Holley 465 CFM carburetor installed -- sitting on an old Edelbrock F4B. The
question is about my 289, which I'm in the process of installing. The
engine has a mild cam, hydraulic lifters, original single point distributor,
Rick's headers and exhaust. When I bought my car, the 260 had a Holley 600
CFM carb on it, which I replaced with the new 465 CFM carb. For the 289, I
was wondering which would be the best choice. I'm thinking of installing
either the 465, the 600, or a 715 CFM Holley. I don't know if the biggest
carb would be best, or if that would simply make the car get horrible gas
mileage. What do you think? What do you have on your Tiger? Thanks in
advance for your advice!
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