XXO/BVGC '38 Chevy Coupe Build

[Milwaukee Midget]

That crush issue concerns me.  Is .001-.0015 going to be sufficient?  The tangs hold it in place, but it's the crush that keeps it from spinning.  It's a long crank with three mains that's going to be taking a pounding.

Yeah, I know, I'm a worrywart . . .

[pops29]

[pops29]

ok I just figured out how to post the pics  LOL  here you go for the lifters

http://www.jalopyjournal.com/forum/picture.php?albumid=31768&pictureid=448279






 I will be sending these off to Dale next week

[38flattie]

Chris, I think we'll be okay with the crush. We're going with a little heavier oil this year,and coated bearings.  With the clearances we have on the bearings, I think we'll be okay.

Stainless, thanks for the invite!

Thanks Tauruck!

Don, Fantastic!

[robfrey]

You guys do nice work! Lord willing, this is going to be a great year for you.

[38flattie]

Thanks Rob!

Well, here we are at the last minute again, this time trying to figure out direct port injection, instead of intake manifold injection.
 
Here is what we are thinking: have an aluminum block/plate that probably is mounted off of a valley plate -- it would be right against the port wall.   These aluminum blocks would be
1/2" thick and tapped for the nozzle.  The blocks would also be located/angled
as necessary for port direction.  Then, there would be a hole drilled through
the cast iron into the port and if there was any material left to thread, then
we'd thread it.  If too thin, then we'd need to seal it with something that can
take boost - like epoxy. there will not be much block material to use - especially on the angled ports (4 of them).

Anyone got a different/better idea?

[Milwaukee Midget]

Just so I'm clear - are you talking about injecting from underneath up and into the back of the valve, or just down and into the port?

 

[38flattie]

Just so I'm clear - are you talking about injecting from underneath up and into the back of the valve, or just down and into the port?

 

Chris, we will come in low in the port, with the nozzles pointed directly at the valves. I can't draw, but this pic shows the angles of the nozzles, and how they will go through the port walls. Hope this makes things a little clearer.

[RichFox]

I did something like that on the V6 I ran in Jacks 788 car. It worked OK on alcohol but not on gas. i thought the gas was not atomizing properly. Or something.

[Freud]

It's good to see a post from you, Rich.

FREUD

[SPARKY]

Buddy, first of all I have never run mech fuel inj. but I have asked a lot of questions to a lot of racers, eng builders and engineers over the last 15 years; I want to second Rich's statment.
 I heard the stories of a guy's  who dramatically helped the performance of some eng's by changing the spray direction the fuel from with, to "into" the oncoming air stream. You need good fuel atomization and distrubution in the incoming mixture to make good power.

Maybe put them in at 90 deg. so you can index them and try rotating the spray slot? Trying different length nozzels to try different heights in the port?

[38flattie]

The mechanical injection is necessary, if we want to continue to run in the Vintage classes, so it will stay, at least as long as the engine is in the car. Once we move to turbos, that will change.
 
Rich and Sparky, these were just our initial thoughts.

We'll go back to putting the ports in the intake. It will be faster anyway, as we won't have to wait on the block.
 
I just had a long conversation with John Beck about this .While he thought it would be a little better, power wise, to put them in the ports, he said it's too big of a PITA!
 
He said the injectors need to be where we can easily access them, as we'll be pulling and looking at them virtually every run. In addition, he said make sure the distribution block is higher than the nozzles, with no low points in the fuel lines, for alky to sit in. We'll make plenty of power with the alky, and nitro if necessary, anyway.

[Roseville Carl]

KISS Buddy, like that idea better...........

[maguromic]

Buddy, Finally got a break from my crazy schedule to read through your last bunch of pages and are impressed with the work you and your talented team are doing.  One thing I did noticed on your dry sump system is you might run into an issue with the amount of vacuum you will create in the rear end and transmission.  Not knowing the size of the scavenge sections of your pump and only guessing its properly on the bigger side, I would run a one way pop off valve to vent the rear and trans.  Its a couple of extra lines (or run a "Y" into one line) back to the breather tank, but cheap insurance.  Tony

[38flattie]

Thanks Tony! I hadn't thought of that, but I'll address it!