B2 Motorsports - Mat Twiehaus 427SBF Build

[byron w]

That is the tallest "low riser" I have ever seen. What is the casting number ? Just for my own edification.

[blykins]

Originally Posted by byron w

that is the tallest "low riser" i have ever seen. What is the casting number ? Just for my own edification.

c3ae-9425-j....

This is for an engine I'm building for a Brit that's running a '63.5 Gal in an FIA road race class.

[byron w]

Well, that is the first time I have been wrong......in the last hour LOL-)

By the way, I am going to need a clutch assy very shortly for my Shell Valley car. Like in a week or two. Also, I want to tlk to you about fixing my Edel hewads that were screwed up. Youi may remember, uneven valve heights.

I hope the nee baby and Katy are doing well. Talk to you soon,
Byron

[ACademic]

This thread has been total gearhead porn. You do awesome work!

[blykins]

Byron, just give me a call, even if it's just to catch up.

AC, thanks for the kind words.

[PLDRIVE]

Brent why would U need a Pop off valve in the drivers side valve cover if u are pulling a vacum ( I'm assuming Daileys pump is a multi stage rotor)? How could an overpressure event occur unless oil pump fails?

Mark

[blykins]

It's not really necessary, but since you can control the amount of vacuum that the pump pulls, it's nice to have. If you don't let it pull any, it's essentially like a breather setup.

It was recommended by Peterson.

[ERA Chas]

Ready to feed formula (Brad Penn) and change diaper (Wix, K&N, Moroso)??
You should be good at that by now...

[blykins]

I have definitely seen my share of baby poop here lately.

Yep, ready to light her off tomorrow...

[Jerry Clayton]

just remember that crankcase vacume on a dry sump is like another oil pressure pump---with enough vacume pull, the engine doesn't need a pressure pump!!!!!!!!

[scottj]

Originally Posted by PLDRIVE

Brent why would U need a Pop off valve in the drivers side valve cover if u are pulling a vacum ( I'm assuming Daileys pump is a multi stage rotor)? How could an overpressure event occur unless oil pump fails?

Mark

The pop off valve is for a sudden pressurization of the crankcase... such as when you burn a piston. Helps prevent blowing the pan off and making a mess on the track.

[ERA Chas]

OK-I'm gonna show my ass and say, 1.35 HP per CI.
570-575 HP @ 6200
540 LBFT @ 4900. Over 400 from 3200 to 6000.
Promise to post the full sheet of best run including VE, BSFC, AFR and weather conditions??
Anybody else want to play the Dyno Jockey Game??
Any experts know how much that dry sump system eats? I'm guessing maybe 15HP??

[951mat]

I don't want to guess a hp number bc I want to temper my expectations. As far as the hp loss from the pump, I'm no expert, but the man that sold it to said about 4 hp. I have no idea what they usually eat. I would've guessed they added more hp than they eat when running on a decent vacuum.

Mat
(yes I'm scared about tomorrow)

[ERA Chas]

Originally Posted by 951mat

(yes I'm scared about tomorrow)

Relax-Brent will have one eye on your engine with the baby in his lap.

[951mat]

OK, I'm scared to ask,but can you guys go ahead and give me some confliciting opinions on the oil line from the oil tank (rear of car) to pressure intake of the pump. It will be -16. guessing on length, maybe 10' long. Does it need to have an inner support spring installed to keep it from collapsing? I'm guessing in a perfect world, it should be well supplied with oil from the tank (as long as it stays fairly full) and not be subject to collapse. Peterson says they don't like those for restriction and turbulence issues. ScottJ told me what he thinks already. Jerry, sounds like you've run dry sumps alot, what are your thoughts?
I case you can't see in the pics, there are no suction lines from the oil pan to the pump, pump bolts directly to the pan and passages are machined into the pan. Thanks for the free advice in advance.



Mat

[ERA Chas]

I'd run a hard line the length of the chassis so no need for anti-collapse spring. Put unions at each end, short braided stainless connectors to tank and block.

[blykins]

Nobody is as scared as I am. ROFL

Chas, I think you're in the ballpark on the horsepower/peaks.

As for the dry sump stuff, I would venture to say that the power it takes to drive a pump shaft and regular oil pump is probably about the same as the power it takes to drive an external pump.

However, as Mat said, the vacuum part of the pump will help things. I'm not going to pull a great deal of vacuum on it, there's really no reason to. I'd rather pull 8-12 on it instead of risk pulling the oil off the wrist pins.....

[vector1]

-16 will be fine, i ran a late model with the tank in the back and that is what was used. you can use this hard line for the scavenge and supply lines and do away with the traditional cooler in front of the radiator.

https://lefthanderchassis.com/v2a/vi...dgroup=2511674

if you use soft line that will work also, will not collapse. aeroquip starlite is some pretty nice stuff and it looks like speedway has it on sale right now. still kind of expensive but i couldn't find the guy i used to buy it from, must be out of business.

Aeroquip Starlite Hose, -16 AN - Speedway Motors, America's Oldest Speed Shop

on second thought i am pretty sure it was -16 line that was used front to back, could have been -20, has been while and it was pretty big stuff. but we did run the hard line on the return and supply.

[PLDRIVE]

Thanks Brent & Scottj
Scottj thats a good point (protecting the track). I did not think in that respect.

Mat what Did Peterson tell u I ran -16 from Tank to Union, then -12 to pump (short run). -16 from pump to union, then -16 to Tank . as Recommended by Patterson and Aviaid.


Mark

[951mat]

The Peterson sales guy just said they didn't like the inner support springs because of the restriction they cause. I like the hard line idea (but not the costs of all the extra fittings....


Mat