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Search found 192 matches

by Rick!
Thu May 13, 2021 7:24 am
Forum: Engine Tech
Topic: Cooling fan shootout - Engine Masters
Replies: 76
Views: 2220

Re: Cooling fan shootout - Engine Masters

Car Craft, May 2000, p50-51. Fan dyno test. No fan 496hp Black Magic fan, running 494hp plastic fan 460hp flex fan 466hp hi-perf flex fan 476hp 6-blade rigid fan 449hp non-thermal clutch fan 485hp 4-blade rigid fan 473hp HD thermal clutch fan 476hp thermal clutch fan 487hp What is the “Black Magic”...
by Rick!
Tue May 11, 2021 2:16 pm
Forum: Engine Tech
Topic: Road Race Track/AutoCross 351w
Replies: 54
Views: 2635

Re: Road Race Track/AutoCross 351w

So with reliability and on track mileage primary goals, that is a starting point 6500 rpm shift point motor? Autocrossing tries to emulate a road course in a very scaled down venue. Hence, you shift to your nominal gear before the first timing cone and leave it there for the whole run. At least tha...
by Rick!
Sun May 09, 2021 8:18 am
Forum: Engine Tech
Topic: Cooling fan shootout - Engine Masters
Replies: 76
Views: 2220

Re: Cooling fan shootout - Engine Masters

That belt is 1/2 or 5/8 inch wide. How much power goes to propelling the mower vs. turning the blades? Come on people, look at the 5 HP electric motor on your shop air compressor, do you see two 5/8" belts? A 3/8" V belt is not going to deliver anywhere close to 30 HP and last 50,000 miles. If you ...
by Rick!
Thu May 06, 2021 6:29 pm
Forum: Engine Tech
Topic: Cooling fan shootout - Engine Masters
Replies: 76
Views: 2220

Re: Cooling fan shootout - Engine Masters

I'm sorry, but am I the only one who thinks that 30 HP to turn a fan is absurd? So, I would need to take a very powerful 30 HP electric motor that spins the fan up to speed (either directly or by gearing it up) to move the same amount of air as the same fan being spun by an engine? Does that seem r...
by Rick!
Wed May 05, 2021 7:34 pm
Forum: Engine Tech
Topic: Cooling fan shootout - Engine Masters
Replies: 76
Views: 2220

Re: Cooling fan shootout - Engine Masters

Running a fan to create airflow thru a radiator takes engine power, period. 30hp seems a bit much for an SBC but it's a data point. You think running a fan clutch is somehow not realistic. Why? Mopar used fan clutches on their stuff forever. What part of not using 1HP more than what is absolutely ne...
by Rick!
Tue May 04, 2021 5:19 pm
Forum: Chassis / Suspension / Body
Topic: Drilled-Slotted Rotors & differential bore calipers
Replies: 5
Views: 169

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: 20
Views: 611

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: 190
Views: 5313

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: 190
Views: 5313

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: 190
Views: 5313

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: 1543

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: 1543

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: 7130

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: 4966

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: 4966

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