2f Turbo

[cruisermatt]

Well don’t be upset when you turn a piston into dust

 

[EWheeler]

I don't think that meets the previously mentioned personal goals.

You want the octane boost added to your pump gasoline to keep from pre-igniting the fuel and destroying your engine if you aren't using modern tech to control timing, fuel, boost. Its a safety measure for boosted engines or engines with high compression that aren't tuned for the higher octane fuels. All of my friends with sand rails running boosted engines that are tuned on 91 octane run it to help keep things living longer. Matt is a good resource regarding boosted engines....

edit to add. Propane was commonly used with older turbo systems because it has a much higher octane rating than readily available pump gasoline, and is much much cheaper and more readily available than high octane gasoline fuels.

 

[cruisermatt]

You want the octane boost added to your pump gasoline to keep from pre-igniting the fuel and destroying your engine if you aren't using modern tech to control timing, fuel, boost. Its a safety measure for boosted engines or engines with high compression that aren't tuned for the higher octane fuels. All of my friends with sand rails running boosted engines that are tuned on 91 octane run it to help keep things living longer. Matt is a good resource regarding boosted engines....

$26 is too much money.

 

[cruisermatt]

I don’t know if I’d say I’m a good resource, I’ve certainly broken some stuff though

 

[Hugh Heifer]

Well don’t be upset when you turn a piston into dust

Thanks for the positive reinforcment. I really appreciate the encouragement.

 

[Hugh Heifer]

You want the octane boost added to your pump gasoline to keep from pre-igniting the fuel and destroying your engine if you aren't using modern tech to control timing, fuel, boost. Its a safety measure for boosted engines or engines with high compression that aren't tuned for the higher octane fuels. All of my friends with sand rails running boosted engines that are tuned on 91 octane run it to help keep things living longer. Matt is a good resource regarding boosted engines....

edit to add. Propane was commonly used with older turbo systems because it has a much higher octane rating than readily available pump gasoline, and is much much cheaper and more readily available than high octane gasoline fuels.

I appreciate that explanation.
I have never tried to add a turbo to anything amd just at the front edge of learning turbo science. This idea was started as a sort of fire side chat and the parts were available for free. I have said everytime this comes up it is an experiment and I would love a sort of buy-in from guys who know way more than I do - at least for their comic relief. If it blows up that would suck but it is just experimental and it would not surprise me. But the alternative would be cool.
Maybe we should make a list of why its dumb or why it won't work vs the opposite.
Sometimes I think guys just take some of this too seriously and don't want to throw something at the wall to see if it sticks.
My goals are these since Matt asked:
A. Build a running engine from a mishmash of parts that really were never meant to go together
B. Get a horsepower boost from those parts that is a bit over what a stock 3FE would give by using a turbo set up
C. Learn a bunch about turbo stuff and some engine stuff I have never had time to learn or understand while I was working 18 hours a day over the past 27 years
D. Maybe learn some basic tig stuff
E. Be entertained and entertaining
F. Prove or debunk the concept without spending a dumb amount of cash
G. Overall have some fun. I like to build things to see if it works. It isn't my job, I am just doing it to entertain myself.

 

[cruisermatt]

Thanks for the positive reinforcment. I really appreciate the encouragement.

 

[Hugh Heifer]

View attachment 4059673

That's more like it.

 

[bj70bc]

-afr gauge to tune it to 11.5 afr wide open throttle (minimum) 10.5 or 11 is better
-you may be removing jets and drilling the carb to flow the fuel you need when tuning
-retard your timing a bunch, disable any automatic advance mechanisms
-1 or 2 steps colder spark plugs
-highest octane fuel you can get ( i used to run octane boost cans in a turboed suzuki i built)
-if over 12 psi, you must intercool, (keep it under 12....)
-move the intake out of the engine bay and wrap your turbo and downpipe

It will all work out

 

[Ditcherman]

I don’t have a lot to add to the conversation, but am interested in learning.
But here’s my contribution, seems like a pretty good guide/rule of thumb.

Let’s be careful out there!

 

[peesalot]

Now thats good tech, I mean from the bc guy, the other guy needs coilovers.

 

[Mace]

Compression with any f series motor really isn't a problem. The 4 main bearings are, but as long as the rotating assembly is well balanced it is not a huge deal. The shorter stroke of the 3F block "Should" make the motor spin a bit easier and decrease turbo lag (with a properly designed turbo). With fuel injection, you can control timing under boost. I believe that the Megasquirt has the ability to do that. And it would be a great benefit. I do not see the real benefit of over 15 lbs of boost on these old motors. Newer higher revving motors can deal with it, but even then, the lifespan is reduced significantly.