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Old 10-27-2015, 11:36 AM
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Rochester 220 TBI Rebuild

Going to rebuild my 220 TBI this fall - waiting for parts.

I am really curious to find out what the diaphragm looks like the holds the fuel pressure regulators... I have read on many gm forums that the failure of this diaphragm is a common problem..

I will post pictures as I go - starting by testing fuel pressure.
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Old 10-27-2015, 12:06 PM
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S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)


SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS

2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER

HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - tiresplease@gmail.com
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Old 11-01-2015, 07:12 PM
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Well rebuilt it and found that Indmar used some non standard truck TBI parts to tune the TBI... so off to Lake Wisconsin Ski Boats it goes...

25psi??? weird.. https://www.youtube.com/watch?v=TzJp...ature=youtu.be

then after taking tbi apart and putting it back together with a rebuild kit had very low PSI - under 5...

re-used old regulator and spring and got it back to 12 psi - strange again.. you can see in the one pic that the bottom of the regulator is adjustable..

still got the hesitation at 2100 to 2500 - or as gm puts it .. sagging...

Will report back after a pro - looks at it.. not ready to spring for the rhinda software yet...
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Old 11-01-2015, 07:13 PM
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Oh .. also - indmar raised up the injector unit to let more air in.. they made some nice mods to the stock car TBI Rochester 220...
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Old 11-01-2015, 09:39 PM
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It was also set up for the 455 that was on the Impala SS instead of the standard 350 if not mistaken - like 7-10mm larger than the 350 TBI.
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Old 11-01-2015, 09:48 PM
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Nice work so far Mike. No leaves or shoes in the boat is the sign of a true professional.
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S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)


SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS

2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER

HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - tiresplease@gmail.com
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Old 11-01-2015, 10:31 PM
SkiWest SkiWest is offline
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First off, sorry to hear of the continued gremlin to be worked out. Second, being a owner of the same boat/engine, thank you so much for your detailed write ups, pictures, and contributions you make for people like me to reference in the future if needed. I know that's the whole purpose of this forum but I usually pay pretty close attention to your work and thank you for that.
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Old 11-02-2015, 03:48 PM
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Quote:
Originally Posted by bret View Post
It was also set up for the 455 that was on the Impala SS instead of the standard 350 if not mistaken - like 7-10mm larger than the 350 TBI.
This is great info... might prove better info for the rebuild kit and spring
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Old 11-02-2015, 04:02 PM
bochnak bochnak is offline
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What rebuild kit/PN did you use?

On a side note, nice MAP sensor location and hose routing
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Old 11-02-2015, 04:04 PM
bochnak bochnak is offline
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BTW, I have a soda blast cabinet and ultrasonic cleaner with carb solution in case it is not clean enough...LOL.
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