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  Johnson 90: Fuel injection; oil injection

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Author Topic:   Johnson 90: Fuel injection; oil injection
whalerron posted 08-31-2001 11:44 AM ET (US)   Profile for whalerron   Send Email to whalerron  
The Johnson Web page say that the oil injection system on the Johnson 90 mixes the proper ratio of oil with the fuel just before delivery to the carbs. Suppose I am out trolling for 1/2 hour and the carb bowls are now full of an fuel to oil ratio of something like maybe 12:1. All of a sudden, I take off and accelerate to WOT. The oil injection system is going to increase the oil ratio to maybe 50:1 but until I run the previous gas out of the carb bowls, the engine will be running the 12:1 ratio when it really needs something like 50:1.

This doesn't sound good. Surely this would shorten the life of the engine. What am I missing here?


Also, what happened to the Ficht Fuel injection system on the Johnsons? Did they just rename it to Quickstart?

Bigshot posted 08-31-2001 01:51 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Nope! at idle you will be around 100:1 maybe 150:1 on certain engines(less oil). By the time you nail the gas and get on plane the bowls are empty of old mixture. Disconnect your fuel line and see how long, eh short it lasts.
Eric posted 09-01-2001 03:20 PM ET (US)     Profile for Eric  Send Email to Eric     
Johnson went to all carb engines. Quick start just gives a shot of gas and increases the timing for an easier startup. My 99 Johnson 90 has quick start and 2 carbs.

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