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Search found 487 matches

by dannobee
Tue Sep 21, 2021 6:19 pm
Forum: Engine Tech
Topic: Head work?
Replies: 5
Views: 322

Re: Head work?

Search this site for "acid porting."

FWIW, way back when, it was the rage in Super Stock when unmolested heads were required. NHRA finally threw in the towel and let us port the heads as long as the volume met their specs.

LOTS of different ways, lots of different techniques.
by dannobee
Mon Sep 20, 2021 12:50 pm
Forum: Engine Tech
Topic: E85 experimental
Replies: 3
Views: 339

Re: E85 experimental

Porsche 956's had air cooled cylinders with water cooled heads. 962's were completely water cooled, but the heads are similar. Since the heads were individual castings, a coolant manifold connected everything. Looking at the google images can give you an idea of the size of the water inlet and outle...
by dannobee
Sat Sep 18, 2021 7:29 pm
Forum: Chassis / Suspension / Body
Topic: The Tail Moves Violently Side to Side Above 100 MPH
Replies: 6
Views: 200

Re: The Tail Moves Violently Side to Side Above 100 MPH

Get under there and put your hands on every component and really try to shake everything. Rod ends usually clunk around before they really get worn, but check anyway. Are you sure that you're working on the right end of the car? Loose front suspension components can do some wicked stuff too. And che...
by dannobee
Sat Sep 18, 2021 6:29 pm
Forum: Engine Tech
Topic: what typically goes on 5.3 first
Replies: 19
Views: 3081

Re: what typically goes on 5.3 first

Put the magnet on the bottom of the oil filter. Then, when you cut it open, have a look at how big the sea urchin grew.
by dannobee
Fri Sep 10, 2021 10:25 am
Forum: Engine Tech
Topic: Hydraulic roller lifters tick only under crankcase vacuum
Replies: 31
Views: 1071

Re: Hydraulic roller lifters tick only under crankcase vacuum

Are you certain that the noise is in fact the lifters?

Crankcase vacuum does strange things to crank seals and distributors, too.
by dannobee
Fri Sep 10, 2021 7:27 am
Forum: Engine Tech
Topic: AC TECH QUESTION?
Replies: 9
Views: 347

Re: AC TECH QUESTION?

The high side can go over 400psi. The low side, not so much, maybe 150 or so if it's hot out and the sides equalized.

Pull the dash out and replace the evaporator.
by dannobee
Tue Sep 07, 2021 11:53 am
Forum: Engine Tech
Topic: SBC head?
Replies: 17
Views: 1362

Re: SBC head?

When you first posted, I figured it had to be a claimer class. Do the bowl work with the cutters as I suggested. The angles that I suggested will work fine. Keep the stock 1.94's for now until you have a few races in the class and can better gauge what you'll need. The 2.02's will likely need to be ...
by dannobee
Sun Sep 05, 2021 9:13 am
Forum: Engine Tech
Topic: fuel return to the tank
Replies: 18
Views: 1076

Re: fuel return to the tank

Maybe follow what the oems have done for decades. The fuel pump is mounted in a 4" or so diameter plastic can with the return going right down the middle of it from the top. This keeps fuel around the pump during cornering and launching, and the return fuel helps keep it full.
by dannobee
Sat Sep 04, 2021 9:44 am
Forum: Engine Tech
Topic: SBC head?
Replies: 17
Views: 1362

Re: SBC head?

Use a 75 degree cutter to open up the throat. Too much and a tech might bitch though. The "best" jobs replicate the factory chatter marks in the bowl. If the 75 is shiny and pretty, you're more likely to get thrown out if they're inspected. Seat angles are important, and unless you have a flow bench...
by dannobee
Sat Aug 28, 2021 7:58 pm
Forum: Engine Tech
Topic: Stainless Steel Valves
Replies: 5
Views: 556

Re: Stainless Steel Valves

For off the shelf stuff, probably the Manley Inconel XH-432 alloy Extreme Duty valves.

Ferrea makes some 6000 series valves that are in the same category, Inconel 'Super Alloy" or something like that. Very high quality too
by dannobee
Tue Aug 24, 2021 5:26 pm
Forum: Engine Tech
Topic: Crankshaft?
Replies: 8
Views: 762

Re: Crankshaft?

Hobby Stock? Way back when, we helped out a guy on a really tight budget. He couldn't afford much more than tires, so building any kind of race engine was out of the question. We had a running but high mile core engine from the dealership that we gave him. Told him to buy a set of rod bolts (little ...
by dannobee
Sat Aug 21, 2021 12:53 pm
Forum: Engine Tech
Topic: 350 Late model stock car racing engine, oil temps high with great water temps, any help?
Replies: 8
Views: 565

Re: 350 Late model stock car racing engine, oil temps high with great water temps, any help?

Those temps are exactly what I like to see as a super late model crew chief for a couple of decades. Run it as is and have fun.

Are you aware of the water and oil temps that current Cup cars are running?
by dannobee
Sat Aug 14, 2021 10:26 am
Forum: Engine Tech
Topic: How many passes on NOS?
Replies: 8
Views: 553

Re: How many passes on NOS?

Ignoring safety factors. 0.5 BSFC *175hp = 87.5lbs/hr or 13.5gal/hr or 0.224gal/minute.

*About* 4 minutes total run time if you could use every ounce of fuel. You'd still need safety factors though. Plan accordingly.
by dannobee
Fri Aug 13, 2021 7:29 am
Forum: Engine Tech
Topic: Visible contaminants in oil
Replies: 17
Views: 485

Re: Visible contaminants in oil

Did you literally drop the pan and change the bearings? Or did you disassemble and clean everything? If the former, there's a good chance that it's just leftover debris from before. If the latter, how well did you clean ALL of the old oil from the block and oil pan? If you're confident in your clean...