Fear Factor

[Snowboat]

As I thrash my way through this boat, with 16 weeks left, I have some fears. When I call Good Vibrations, the young tech guy tells me that mid throttle operation is unattainable, with mechanical fuel injection. I find that hard to believe. I'm fairly handy and have seen boats run at what appeared to be a midrange operation. Before I buy carbs, are there any reassuring comments on the midrange capabilities of old style injection systems. I would like to be able to idle (briefly) and be able to run 2k to 4.5k for a long period when necessary. I could have put this in Gear Heads but I'm looking for v drive answers.

[Fiat48]

O.k. First. What injector are you going to run?
And this is blown or unblown?
Describe what you have.

[Snowboat]

Fiat, it's blown 8-71, 467 BBC on gas at a little less than 8:1. I'll run it mostly on AV Gas. I just don't wnat to have to put it in the water and either idle or haul ass. There are times when covering some ground is good.

[Fiat48]

and what injector?

[Snowboat]

An Enderle birdcatcher with an 80 pump.

[Fiat48]

You will get a cycling at idle. If you try to clear that cycling (motor going up and down in rpm) with barell valve adjustment then you will get a lean spot...a cough or backfire through the injector when the throttle is opened suddenly.
So..you have to live with that idle surge.
Part throttle as Endlerle has designed will be fat. It will cruise fine...just be fat. It's hard to hold a steady throttle as the butterfly area is big and all it takes is a wiggle of the toe to speed up.
The injector wasn't made for part throttle cruising much. But that does not mean it is that bad and it can be made better.
Start with a 29 nozzle. 130 pill installed in the barrell valve as Enderle does originally. If a used injector...make sure it is a gas injector and not alcohol. If it is alcohol...don't panic. Just a few changes are in order to make it work on gas. Do not plumb in a high speed check valve at this point.
Make sure the brass bypass can has a light tension spring in it with no shims. It should be about a 2lb check.
Fire the motor and adjust the barrell valve position as needed. Lengthening the linkage makes the idle richer. Shortening the linkage makes the idle leaner.
Adjust the linkage slowly...a couple flats at a time. Lean the thing until the surging starts to go away. Then richen it 2 flats from there. A quick yank on the throttle and check there is no hesitation.
Take it for a run. If you feel a hesitation in the throttle opening with a load on the motor...then simply give the linkage another flat in the rich direction. Play with the barrell valve adjustment till you get the best idle...and no hesitation.
There are things you can do to help lean while cruising. But start out this way. Many things you can do with constant flow...it is just a matter of adjustments and bypasses. But you need to tune the wide open end before working the part throttle end. Then I can tell you many, many ways to make the injector better at smaller throttle openings.

[superdave013]

I had pretty much the same set up and cruised the boat all over.

[Snowboat]

Thanks Fiat. It sounds like I can live with a fat midrange, its hard to leave it there anyway, sounds like one can clean it out if necessary. Since its winter, I'll get a bunch of extra tuning parts for the early summer. Thanks.

[Fiat48]

It won't be that fat at cruise when you get close to the main jet required overall. It will just be on the fat side. If it is black smoking at cruise...you are way off on the main jet. You could wind up with as large as a 150 for a main jet. All depends on the blower, combo etc. 130 will be safe to start. Small nozzle makes a better high pressure system...better for cruise.
My boat on alcohol does fine at part throttle. Just so damn throttle sensitive.
If blower speeds are kept down and boost low...smaller nozzles can be used. Like I say...many things one can do. You could even put in a manually operated bypass...to bypass fuel when a button is held down. This along with the right barrell valve adjustment can make a surge free and smooth idle...for no wake zones....but don't ever hit the throttle with the button down or bye bye blower.

[Snowboat]

I would like to try something new (injection) but it sounded like the young fella at Good Vibes was taught to not guarantee injection at anything less than WOT. Nothing ventured, nothing gained. More questions in a month or so, particularly on primer systems and no wake zone applications. Thanks.

[INEEDAV]

I would like to try something new (injection) but it sounded like the young fella at Good Vibes was taught to not guarantee injection at anything less than WOT. Nothing ventured, nothing gained. More questions in a month or so, particularly on primer systems and no wake zone applications. Thanks.
Ken
As an note, you do have a supplier of methanol there close to you in Gillette, Fleischli Oil.
Billy

[Morg]

Ken
As an note, you do have a supplier of methanol there close to you in Gillette, Fleischli Oil.
Billy
Hey Billy,
Speaking of running the clear stuff, When are you going to step up. You might need to, to keep up with the Jone's. Or at least the Morg's. :) :) :)

[INEEDAV]

Hey Billy,
Speaking of running the clear stuff, When are you going to step up. You might need to, to keep up with the Jone's. Or at least the Morg's. :) :) :)
As soon as I can find a good buy on a blower, hat, pump, etc. Currently I am trying to talk my self out of buying Tony's boat, I have to get that completed before I can buy much of anything else. Honestly though, which boat would be the most fun with blown alcohol, I would have to say both :rollside:

[Snowboat]

Sounds like you need some help on Ton'ys boat. At your age, amortized over fifty years, its only $0.33 per day.

[INEEDAV]

Sounds like you need some help on Ton'ys boat. At your age, amortized over fifty years, its only $0.33 per day.
Ken, I just talked this over with legal counsel here at the office, your post could be construed as an offer to finance the boat for me on a fifty year note at $.033/day.
I'll take it. Could you write the transportation costs into that for me and add the $0.07 per day for that.
Actually, the money is not the issue. Its the cost of that divorce that keeps getting brought up everytime I mention an additional boatl.

[Wildboats]

Not sure how to post a quote. fiat48's post had me sit back and think a bit. So if the blower speed was increased from 10 under to 10 over on a 14 the pill and nozzles should be changed in order to deliver addl. fuel ? (gas deal)

[Fiat48]

Not sure how to post a quote. fiat48's post had me sit back and think a bit. So if the blower speed was increased from 10 under to 10 over on a 14 the pill and nozzles should be changed in order to deliver addl. fuel ? (gas deal)
Was not talking a 14/71. Nozzle size was chosen because of Ken's application. I never run a 14/71 because I don't need all that blower. So I have no experience with 14/71's.
But if I were to run a 14/71 I would run at least a 30 nozzle or a 31. And you would have to change the pill size for changing the blower that much by a bunch..depending on how good your blower is.
One way to do this is say you are tuned pretty good at 10 under and you are going to go 10 over. Reduce your main jet pill "area" by 30% to start. That should put you on the fat side. Then tune from there.
When in doubt..fatten it.

[Carnivalride]

An Enderle birdcatcher with an 80 pump.
Hey Fiat48,
Would it idle better with a bugcatcher or would that hurt him on the top end?
When do typically you switch from a bug catcher to a bird catcher?

[Wildboats]

Fiat thanks for the input, I was not trying to hijack the thread, Just have a few questions.

[Fiat48]

Hey Fiat48,
Would it idle better with a bugcatcher or would that hurt him on the top end?
When do typically you switch from a bug catcher to a bird catcher?
Naw...wouldn't idle any better with a bug. Same fuel system just a smaller hat. And I know a bug would not hurt his top end. I've run both and can find no real difference. I think it has more to do with popularity as the bird is the popluar unit.