B2 Motorsports - Gary Bowman 445 SBF Build

[scottj]

Originally Posted by blykins

Well, I can't post any pictures, but I can give a situation report....hahaha

The build has been upgraded to a dry sump build, along with some other goodies. I ordered Gary's Aviaid oil pan and went with Jones Racing to supply the pump, brackets, mandrels, etc.

I spent about 2.5 hours today cycling the fasteners on the Oliver rods, measuring the stretch, and then checking rod bearing clearances.

If you think that engine builders charge too much, I'll remind you of how long it takes to just set the rod bolts...hahaha These rods give a torque angle spec as well as a stretch spec. Basically you get the rods, remove the fasteners, clean everything, then lube the fasteners up really good. The bolts torque at 30 lb-ft plus 44 degrees, then you check the stretch, which is supposed to be around .0053-.0055". Before you do that though, each fastener has to be cycled 2-3 times, which includes lubing them up, setting the torque, loosening them, lubing them again, setting the torque, loosening them, lubing them up, then setting the torque again. Eight times. My $450 digital torque wrench makes this a breeze... (I will also admit to enjoying the beep and the vibration when I achieve spec....hahaha)

Gary's came in right in spec with most being .0055" stretch, after adding about 2° more angle to the torque spec.

All of the journals on the Callies crank were within .0002" of each other.

I don't want to ruin the magazine article, but the valve covers for this engine are super sweet....I had some wrinkle finish black valve covers CNC'd with my logo and the displacement of the engine. They look awesome.

Sounds like fun...

Which bolts are you using?

[blykins]

They are the Oliver A1 XTF bolts. 7/16"...

[Cashburn]

This thing is going to be a Hulk...

[GBowman]

YES in angry mode too

[blykins]

Got 'er dun.

Dyno day is the 31st, not sure when the magazine article will come out. However, here's the finished product.

[lippy]

Brent, why did you decide to go with a dry sump?

[blykins]

Originally Posted by lippy

Brent, why did you decide to go with a dry sump?

Well, a couple of reasons...

1. Hood clearance. The dry sump pans are generally around 3-4" tall, compared to 7-9" for a wet pan. This allows you to sit the engine down in the car further and allows for more intake manifold.

2. Performance. This engine will probably get beat on pretty hard, and with the cornering capabilities of Gary's new car, it is an insurance point.

3. Horsepower. With a dry sump pump, the scavenging part of the pump will pull a little vacuum on the crankcase. This allows me to use a piston ring pack geared more towards making power. There is also less windage because the oil is not stored in the pan.

4. Cookie-cutter-ness. This engine is very close to a race engine. Solid roller, belt drive, stud girdle, fully ported heads/intake (the heads flow over 350 cfm at max valve lift), etc. The dry sump adds to the overall "theme" of the engine.