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Search found 187 matches

by Rick!
Tue May 04, 2021 5:19 pm
Forum: Chassis / Suspension / Body
Topic: Drilled-Slotted Rotors & differential bore calipers
Replies: 2
Views: 59

Re: Drilled-Slotted Rotors & differential bore calipers

Maybe look up essexparts.com and talk to Mike O’Neil.
He hangs out on an SAE forum now and then and seems to be well versed in performance braking.
by Rick!
Mon May 03, 2021 11:07 am
Forum: Engine Tech
Topic: EFI Fuel Pressure Drop ~5psi
Replies: 17
Views: 353

Re: EFI Fuel Pressure Drop ~5psi

340 - in tank pump? Sock installed correctly? Mounted so it has a sump to pull from? Where is the return line pointed at in the tank? You don't want it pointed at the pump pickup, in most cases. Driving it with a relay? SS relay? Power is coming from a rear or front mounted battery? Measuring voltag...
by Rick!
Wed Apr 28, 2021 7:26 am
Forum: Engine Tech
Topic: Building an 11 second 70's nostalgic SBC
Replies: 173
Views: 4150

Re: Building an 11 second 70's nostalgic SBC

Quarter Pro estimates the following: 3600lbs, 3.73 rear gear, 455hp @ 6500, 2.85 1st gear: 11.97@112.5 with perfect traction and some clutch slip 3800lbs, 4.56 rear gear, 455hp @ 6500, 285 first gear: 11.99@111.8 with perfect traction and some clutch slip The car is listed at 3662 lbs so the driver ...
by Rick!
Mon Apr 26, 2021 11:59 am
Forum: Engine Tech
Topic: Building an 11 second 70's nostalgic SBC
Replies: 173
Views: 4150

Re: Building an 11 second 70's nostalgic SBC

Houston regularly sees a 30.3 baro and NEGATIVE 500-1000 below sea level. The NHRA altitude correction factor is .9405 for Denver, I've never raced in under 8000 DA Denver. Houston is the exception, not the norm in Texas. The DA was 1800 yesterday less than 2 hours away from Houston. airdensityonli...
by Rick!
Sun Apr 25, 2021 2:19 pm
Forum: Engine Tech
Topic: Building an 11 second 70's nostalgic SBC
Replies: 173
Views: 4150

Re: Building an 11 second 70's nostalgic SBC

I ran 12's with a junk 350 in a 3600lb hx holden in my youth. Unbalanced mostly stock 350 with flat tops, hydraulic crane 28x cam, stock Morse chain, stock pushrods rockers etc, lt1 springs. Junk smog heads, 76cc chambers, 1.94/1.5 valves & home porting (before I knew what I was doing), torker inta...
by Rick!
Thu Apr 22, 2021 8:14 am
Forum: Engine Tech
Topic: overheating question
Replies: 61
Views: 1431

Re: overheating question

If you completely block the bypass, you can blow out a Welsh plug at high rpms. Ask me how I know..... A bit off topic but perhaps worth mentioning - the old wives tale about the engine overheating if you remove the thermostat *supposedly* because the water then makes such a quick trip through the ...
by Rick!
Tue Apr 20, 2021 8:14 am
Forum: Engine Tech
Topic: overheating question
Replies: 61
Views: 1431

Re: overheating question

What is the definition of a bypass? You changed the cooling system to warm up faster and now it has less flow through the radiator at very low flow. Put a valve in the bypass line and shut it off and see where the idle temp goes. Most, not all, but most real bypass systems have a poppet valve on the...
by Rick!
Mon Apr 12, 2021 1:47 pm
Forum: Chassis / Suspension / Body
Topic: go kart chassis setup
Replies: 10
Views: 7076

Re: go kart chassis setup

I have not raced a kart in over 50 years, but I see no mention above of the sometime dated(?) advantage of lifting ever so slightly the inside rear tire on a solid axle kart in the tighter turns on asphalt tracks. Has this thinking been debunked? No. When I was at the Mannheim indoor track somewher...
by Rick!
Mon Apr 12, 2021 7:34 am
Forum: Engine Tech
Topic: Air pressure @ 100 mph?
Replies: 28
Views: 4939

Re: Air pressure @ 100 mph?

This is an old thread, but there are a few circle track boat racers who just run a standard scoop backwards and it acts as a cowl induction. With a tunnel ram the front carb gets good airflow to it. Cowl induction works because of the slight "high pressure" at the intersection of the hood and winds...
by Rick!
Sat Apr 10, 2021 11:40 pm
Forum: Engine Tech
Topic: Air pressure @ 100 mph?
Replies: 28
Views: 4939

Re: Air pressure @ 100 mph?

Real data from a MAP sensor inside the tunnel ram which is downstream of the scoop on my brothers SPro dragster:
+.25-.29psi @ 140mph
+.50-.59psi @ 171mph

your pressure may vary
by Rick!
Fri Apr 02, 2021 7:49 pm
Forum: Engine Tech
Topic: Road Race Track/AutoCross 351w
Replies: 49
Views: 2300

Re: Road Race Track/AutoCross 351w

In the shopping cart list of enhancements, I didn't see tires.
Are you running street legal stickies with shaved tread or....?
by Rick!
Mon Mar 29, 2021 7:19 pm
Forum: General Tech
Topic: GRADE 2 Titanium bolt Strength
Replies: 22
Views: 453

Re: GRADE 2 Titanium bolt Strength

That’s not how hydrogen embrittlement works. If you research titanium bolt hydrogen embrittlement, you should find a reasonable study by hynickelalloy.com. Hydrogen is “installed” during manufacturing and or electroplating processes, not from rubbing a Cad plated nut on it. So far I've found multip...
by Rick!
Mon Mar 29, 2021 1:06 pm
Forum: General Tech
Topic: GRADE 2 Titanium bolt Strength
Replies: 22
Views: 453

Re: GRADE 2 Titanium bolt Strength

Titanium is corrosive resistant in general from what I've read. The embrittlement from Cadmium plating I mentioned was like if using a Ti bolt with say a steel cadmium plated nut Weight savings are savings if your willing to put the time and money into them. Other means and materials are often chea...
by Rick!
Sun Mar 28, 2021 8:42 pm
Forum: General Tech
Topic: GRADE 2 Titanium bolt Strength
Replies: 22
Views: 453

Re: GRADE 2 Titanium bolt Strength

Grade 5 Ti is corrosion resistant without plating. (ref link above). Electro plating a Gr 5 Ti bolt doesn’t pass the “good quality screw” sniff test. Mechanical plating like zinc flake or the use of electroless nickel are better options.
What’s your projected weight savings with Ti hardware?
by Rick!
Sat Mar 27, 2021 8:21 am
Forum: General Tech
Topic: GRADE 2 Titanium bolt Strength
Replies: 22
Views: 453

Re: GRADE 2 Titanium bolt Strength

It appears Grade 5 Ti 6al-4v is what you might want to consider. It has a strength similar to a Class 10.9 but its stretch will be considerably more due to a much lower Young’s modulus (E) as compared to steel. https://material-properties.org/what-are-properties-of-grade-5-titanium-alloy-ti-6al-4v-d...