Hi. I use a Boss 302 spacer under my 1848. It's very thin and has a port
for the PCV valve. Can you run a Tiger with no spacer? I thought the high
heat would certainly cause the carb to boil.
On 6/21/10 7:51 PM, "Buck Trippel" <BuckTrippel@Verizon.net> wrote:
> Last summer we drove one of our Tigers over 3500 miles in ten days to & from
> SUNI.
>
> It was equipped with a H-Po 289 & a Holley 600 cfm Vac secondary carb with a
> T-5.
>
> To the seat of the pants, the felt great even at nearly 11,000' elevation
> over the Bear Tooth Highway in Montana. Door to door we averaged almost 24
> MPG. We never changed jets but twice adjusted the idle screws on the
> primaries (about 1/12th a turn each time.)
>
> However we also borrowed a neat device from our racecar - an Innovate LM-1.
> The LM-1 reads fuel ratios and is accurate to a tenth. We took notes of
> manifold vacuum, fuel ratio, speed and elevation the entire trip.
>
> Since I was a teenager, I've "known" that a properly adjusted 1850 runs fine
> with a 289. However I live on the edge of the Pacific Ocean, literally at
> sea level. What I discovered last summer is that there is not enough signal
> for this carburetor once the vehicle has climbed above 4 to 5,000'
> elevation. The carb works but the precision disappears. At the higher
> elevations the carb was always too rich or too lean. It was never "just
> right". Then on the way home, as we decended from Park City to Provo, the
> precision came back to life. Last summer I learned that the Holley engineers
> knew much more than I'd given them credit for. (I owe them an apology.)
>
> One caveat. Many of the smaller (Holley) carbs do not have a port for a PCV.
> You can run a plate under the carb but some Tigers then have air cleaner
> issues. Many years ago Steve Laithman combined the top of his 450 with the
> base plate of a 600 which had the PCV port. I like to run the PCV valve
> because it keeps the engine compartment cleaner.
>
> Right now we're experimenting/dialing in a 390 CFM Holley as a replacement
> for the 600CFM. It's looking encouraging.
>
> Buck Trippel
>
>
> ----- Original Message -----
> From: " Ron Fraser" <rfraser@bluefrog.com>
> To: "'Tom Parker'" <tkparker1941@gmail.com>; "'wsamouce'"
> <wsamouce@kc.rr.com>
> Cc: "'Tigers Den'" <tigers@autox.team.net>
> Sent: Monday, June 21, 2010 12:58 PM
> Subject: Re: [Tigers] Best Carburetor(s) for the Tiger
>
>
>> BTW, when the Tiger ran I'd have been proud to get 18 - 20 MPG at highway
>> speeds. I think 28 MPG is a tad high with a 4 speed, improbable even with
>> a
>> carbureted engine and a 5 speed, but probable with a 5 speed, fuel
>> injection
>> and an engine management system.
>>
>>
>>
>>
>>
>> I easily get 25 MPG and my friends MK II with 600 cfm, 4 bbl gets about 22
>> MPG. I once saw 29 MPG but only once. I'm pushing the ignition and
>> carb
>> tune on my 260 to the max and I hope to cross the 30 MPG mark. If I do
>> cross 30 MPG constantly I will report back on that.
>>
>> Ron Fraser
>>
>> 260, 2 bbl, 4sp
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