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Search found 519 matches

by Ken_Parkman
Thu Dec 01, 2022 9:57 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

HP = M ass x D istance / T ime if: Mass = 3000 lbs Distance = 1320 ft Time = 12 sec, then: HP = 3000lbs x 1320ft /12sec = 330,000 lbft/s = 600HP Horsepower is a valid indicator of how much power is needed for a 3000lb car, to cover 1320 ft, in 12 s. But it does not tell us anything about accelerati...
by Ken_Parkman
Fri Nov 25, 2022 10:14 am
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

Probably not, depending on the converter. I'm a believer in the more converter less gear theory. A very important point is a good converter that properly torque multiplies, or more correctly does not waste power. With the 3.06 (?) low, 2 or more ratio through the converter, and rear axle you might (...
by Ken_Parkman
Wed Nov 23, 2022 5:20 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

This is actually the point, and how you optimize. That input shows a rpm drops of 21, 33, and 38% and the point is the curves do not cross. So it is not optimized and cannot be with this data. You should run the engine high enough to understand how it drops off, and knowing the characteristics you ...
by Ken_Parkman
Wed Nov 23, 2022 5:13 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

It is a long way, and might be a good way to get a slap in the face with a connecting rod. Shows the problem of a wide gear ratio and a big rpm drop. If you had a usable power curve to that rpm it may be possible. But it also shows why closer ratios and more speeds with a stick is faster. The good n...
by Ken_Parkman
Wed Nov 23, 2022 3:08 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

The question what is wrong with the chart (if you are serious) is it cannot improve real performance as we cannot optimize the driveline with that data. As you used the torque input there is not a crossover for different gears and we have no idea how optimize even the shift point. The torque curve ...
by Ken_Parkman
Wed Nov 23, 2022 2:51 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

it looks to me like you should shift at 55 mph & 92mph to maximize acceleration ... Am I missing something? If you shift at 55 mph the acceleration takes a sudden drop from .76 g to .58, and the 3-4 shift drops .41-.33. If we had a complete power curve we should be able to do a lot better than that...
by Ken_Parkman
Wed Nov 23, 2022 2:00 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

. The actual engine torque peak rpm should never be seen in performance use unless you have drivetrain limitations, and if you can it is much preferred to fix the drivetrain. Do you mean to say that if my engine makes peak torque at 4000 RPM, and my converter flash stalls to 4000 RPM (as observed t...
by Ken_Parkman
Wed Nov 23, 2022 1:55 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

it looks to me like you should shift at 55 mph & 92mph to maximize acceleration ... Am I missing something? If you shift at 55 mph the acceleration takes a sudden drop from .76 g to .58, and the 3-4 shift drops .41-.33. If we had a complete power curve we should be able to do a lot better than that.
by Ken_Parkman
Wed Nov 23, 2022 1:26 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

This is actually the point, and how you optimize. That input shows a rpm drops of 21, 33, and 38% and the point is the curves do not cross. So it is not optimized and cannot be with this data. You should run the engine high enough to understand how it drops off, and knowing the characteristics you c...
by Ken_Parkman
Wed Nov 23, 2022 12:15 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 289
Views: 6735

Re: How will you go faster?

David your own simulation data proves these statements incorrect. It does nothing of the sort. What do you feel is incorrect? Could you please provide a concrete example with real numbers? How is it possible your better calculated performance is with the lower of your chosen input parameters if the...
by Ken_Parkman
Thu Nov 03, 2022 4:03 pm
Forum: Engine Tech
Topic: Engine Masters Tests LS Oil Pumps
Replies: 20
Views: 1236

Re: Engine Masters Tests LS Oil Pumps

As an added note on the bypass flow it is flow at a pressure; part of Q, so included in the power calculation. Still a small number. Be interesting to add the power total of all the pressure + scavenge stages.
by Ken_Parkman
Thu Nov 03, 2022 8:35 am
Forum: Engine Tech
Topic: Engine Masters Tests LS Oil Pumps
Replies: 20
Views: 1236

Re: Engine Masters Tests LS Oil Pumps

Fluid power is PQ/1714 where P is psi, Q is flow in gpm. So both pressure and flow are linear factors. Oil pump power is as stated above on the order of 1 hp, and a significant difference is showing some kind of serious problem. Poorly designed pumps can be subject to internal hydraulic lock. A long...
by Ken_Parkman
Fri Aug 19, 2022 11:59 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Temperature issues
Replies: 49
Views: 2035

Re: Temperature issues

I have had an electric fan system cause highway overheating; excessively restrictive to airflow if the shroud forces all the air to go through the fan or fans.
by Ken_Parkman
Fri Aug 12, 2022 9:30 pm
Forum: Engine Tech
Topic: This intake port mold really tells the story
Replies: 35
Views: 2475

Re: This intake port mold really tells the story

The first comment is be very careful porting on iron heads the second time as you have lost your 'zero' point. Unless you know exactly how much material is there don't do it. The biggest csa is at the valve area and the csa increases around the bend to the exit. This makes flow separation likely abo...
by Ken_Parkman
Sat Aug 06, 2022 1:36 pm
Forum: Engine Tech
Topic: Head Studs
Replies: 28
Views: 1629

Re: Head Studs

The problem with adding the extra bolt (I use a 3/8" stud) to an existing engine is this is fairly close to the bore and it distorts the bore a touch. This is one of those things you should do with a torque plate.