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Old 08-31-2019, 02:11 PM   #1
Daveyjonez
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Default 81ís tri power or dual 97ís

Hi Guys:

I have a nicely built 276 Flathead and I am deciding on the fuel system. I have 2 very nice 81ís and I thought acquiring 1 more and running a 3x2 setup might be a consideration. Or, should I stick to 2 97ís on a dual carb manifold (I would have to purchase a couple of 97ís.??

Any input?

Thanks!!
Dave
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Old 08-31-2019, 02:48 PM   #2
frnkeore
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Default Re: 81ís tri power or dual 97ís

Personally, I think three 81's would be a very good, all around setup. Especially with a mild cam.

Could give better gas mileage, too if you an keep your foot out of it But, I love the sound of a over carburated engine, winding up!!!

Frank
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Old 08-31-2019, 03:21 PM   #3
JSeery
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Default Re: 81ís tri power or dual 97ís

Might read JWLs book, he list dyno runs on several setup.
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Old 08-31-2019, 03:48 PM   #4
uncle max
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Default Re: 81ís tri power or dual 97ís

It's hard to beat the throttle response of three 81's on a rascally flathead!





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Old 08-31-2019, 04:09 PM   #5
deuce_roadster
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Default Re: 81ís tri power or dual 97ís

I am running 2 81s on an old Eddie Meyer manifold and am quite happy with them. I'm sure you could get 3 to run very well.
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Old 08-31-2019, 04:40 PM   #6
Daveyjonez
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Default Re: 81ís tri power or dual 97ís

Thank you guys! I really wanted to use the 81’s- I really appreciate the input.
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Old 08-31-2019, 04:45 PM   #7
Ol' Ron
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Default Re: 81ís tri power or dual 97ís

Yes, the 81's should give better "street" response. Might be alittle shy at the top end. Depends allot on the cam. 1007B would be nice/
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Old 08-31-2019, 04:48 PM   #8
Daveyjonez
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Default Re: 81ís tri power or dual 97ís

I had Pete grind me 1007b, which is in the motor- I felt like it would lend itself well also, thank you Ron
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Old 08-31-2019, 05:58 PM   #9
Init1
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Default Re: 81ís tri power or dual 97ís

I prefer 2 carbs . 3 carbs can be difficult to tune and will take some tinkering to make work right.
You probably would only use 2 anyway most of the time with a progressive linkage.
But...the 3 carbs look really cool.

Last edited by Init1; 08-31-2019 at 05:59 PM. Reason: Photo
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Old 08-31-2019, 06:13 PM   #10
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Default Re: 81ís tri power or dual 97ís

I have an original Navarro 3 carb manifold that I thinking of parting with. Been told that it was way good
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Old 08-31-2019, 06:49 PM   #11
KiWinUS
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Default Re: 81ís tri power or dual 97ís

3 Stromberg 81s @ a KiWi-L100 & you can’t go wrong!!! So many know this but won’t admit ��
Enjoy
Cheers
Tony
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Old 08-31-2019, 07:27 PM   #12
scicala
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Default Re: 81ís tri power or dual 97ís

[QUOTE=uncle max;1794012]It's hard to beat the throttle response of three 81's on a rascally flathead!

Uncle Max, can you educate me ? Is the 81 a smaller carb (airflow wise) than 48's and 97's ? Also what years and on what engine were the 81's used ?
Thanks for any info.


Sal
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Old 08-31-2019, 10:08 PM   #13
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Default Re: 81ís tri power or dual 97ís

81's were the 60 hp carb
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Old 09-01-2019, 04:26 AM   #14
aussie merc
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Default Re: 81ís tri power or dual 97ís

eye candy appeal you cant beat a tri power just dont over carb but its up to you and what ever makes your bell ring [but ring it long and loud]
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Old 09-01-2019, 12:27 PM   #15
scicala
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Default Re: 81ís tri power or dual 97ís

Quote:
Originally Posted by cas3 View Post
81's were the 60 hp carb


Thank you, Sal
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Old 09-01-2019, 12:33 PM   #16
JWL
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Default Re: 81ís tri power or dual 97ís

For a "driver" the better combination is a center 81 with two ends of 97 or 48 with progressive linkage. However, the setup time and expertise should not be ignored.
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Old 09-01-2019, 12:47 PM   #17
Daveyjonez
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Default Re: 81ís tri power or dual 97ís

Thanks JWL, that makes sense given the increased volume provided by the secondary carbs- good throttle response low, and volume up high.

Thanks Again
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Old 09-01-2019, 01:03 PM   #18
drolston
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Default Re: 81ís tri power or dual 97ís

Take whatever time needed on the bench to get the progressive linkage set up perfectly, so that both end carbs are precisely and fully closed at idle, with the idle adjustment screws backed completely off. Do that with the carb tops off of the carb base so that you can easily see the throttle plates. If the throttle plates are not perfectly centered or stick a little, fix them. Completely close the idle jet adjustments on both end carbs so that idle adjustment is all on the center carb. Don't go cheap on the progressive linkage as the cheap stuff tends to flex and adjustments slip. One of the end carbs pulls or pushes the other end carb; you can take the accelerator pump spring off of (or simply unhook) that carb to lessen the strain on the linkage.

I put 2" risers on my tri-power, which enabled me to invert the progressive linkage. That way I could use banjo fittings for plumbing fuel lines to the carbs, and I could retain the manual throttle control on the center carb. Took just a little grinding on one end riser and the underside of the fuel pump to get clearance for the linkage.
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Old 09-01-2019, 01:13 PM   #19
Daveyjonez
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Default Re: 81ís tri power or dual 97ís

Looks good, thanks for the reply
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Old 09-01-2019, 08:55 PM   #20
Bored&Stroked
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Default Re: 81ís tri power or dual 97ís

Quote:
Originally Posted by KiWinUS View Post
3 Stromberg 81s @ a KiWi-L100 & you canít go wrong!!! So many know this but wonít admit ��
Enjoy
Cheers
Tony
Now Tony - relax a bit . . . you don't have the only cam that can't go wrong! Also, I've done many bad things - and remember only a few! LOL

Cheers Dude!
B&S
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