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Forum: 928 Forum
02-11-2019, 07:59 PM
Replies: 106
Views: 5,262
Posted By ptuomov

Stupidly busy...

The day job has kept me pretty busy since the stock market started doing its yo-yo action in October.

Based on casual browsing of the threads, it appears that not a whole lot has changed in here...
Forum: 928 Forum
11-10-2018, 12:42 AM
Replies: 106
Views: 5,262
Posted By ptuomov

This graph explains a lot about my posts in this...

This graph explains a lot about my posts in this group over the last nine years.

I've aspired to make my personal mount stupid a little shallower on this topic of manual transmissions...

...
Forum: 928 Forum
11-09-2018, 11:06 PM
Replies: 106
Views: 5,262
Posted By ptuomov

I wonder how that pushing apart was measured? ...

I wonder how that pushing apart was measured?

In terms of temperature management, I think there are two things that matter. First, is the oil causing more losses and therefore more heat. ...
Forum: 928 Forum
11-09-2018, 08:19 AM
Replies: 106
Views: 5,262
Posted By ptuomov

Too much oil on the gears is one of those...

Too much oil on the gears is one of those theoretical problems like having too much money, or having too low body fat percentage, etc.
Forum: 928 Forum
11-05-2018, 12:56 PM
Replies: 106
Views: 5,262
Posted By ptuomov

I disagree.

I disagree.
Forum: 928 Forum
11-03-2018, 06:09 PM
Replies: 106
Views: 5,262
Posted By ptuomov

One out of three trannies got some oil squirter...

One out of three trannies got some oil squirter holes today. The geometry of the original idea of going thru the lid didnít quite work out, so holes thru the case then.

...
Forum: 928 Forum
10-11-2018, 10:43 AM
Replies: 106
Views: 5,262
Posted By ptuomov

There are now three transmissions being built for...

There are now three transmissions being built for me. Each will have a little different parts and a little different methods. Two will get cryo, all three micropolish, some have new gears, some...
Forum: 928 Forum
10-09-2018, 11:05 PM
Replies: 106
Views: 5,262
Posted By ptuomov

Nothing yet

[premature, deleted]
Forum: 928 Forum
09-30-2018, 10:33 AM
Replies: 106
Views: 5,262
Posted By ptuomov

John Kuhn had some gears measured at a lab, which...

John Kuhn had some gears measured at a lab, which used Knoop method. The Knoop method is local enough to be useful for gears, while Rockwell C test is not as useful. What's confusing is that the...
Forum: 928 Forum
09-29-2018, 07:29 PM
Replies: 106
Views: 5,262
Posted By ptuomov

I read about that and it turns out these gears...

I read about that and it turns out these gears should be tested using the Vickers or Knoop tests.

"For instance when hardness is checked on a mounted tooth sample, it is typically checked by...
Forum: 928 Forum
09-29-2018, 04:47 PM
Replies: 16
Views: 559
Posted By ptuomov

What's the theory that crankcase gas flows would...

What's the theory that crankcase gas flows would improve with the flat plane crank compared to a cross-plane crank?
Forum: 928 Forum
09-28-2018, 01:40 PM
Replies: 6
Views: 1,406
Posted By ptuomov

Could do that, or just try it to see if it fits...

Could do that, or just try it to see if it fits into the '87-'98 rear end.

*
Forum: 928 Forum
09-27-2018, 08:27 PM
Replies: 6
Views: 1,406
Posted By ptuomov

Does the ZF number 4061006320 always mean '87-'89...

Does the ZF number 4061006320 always mean '87-'89 LSD? What is the significance of the second part of the number, for example 121782S40?
Forum: 928 Forum
09-27-2018, 12:37 PM
Replies: 106
Views: 5,262
Posted By ptuomov

Can anyone identify LSDís?

Any help with identifying these LSD units based on numbers? Iím looking for Ď87-89 units.


...
Forum: 928 Forum
09-24-2018, 06:13 PM
Replies: 114
Views: 5,332
Posted By ptuomov

Those regulators also have issues in boosted...

Those regulators also have issues in boosted cars. The issue is related to thermal expansion. I doubt it's an issue with a short run on an engine dyno, but if you have an Aeromotive FPR (or any...
Forum: 928 Forum
09-24-2018, 03:40 PM
Replies: 114
Views: 5,332
Posted By ptuomov

A much safer (to the engine) way to do that is to...

A much safer (to the engine) way to do that is to run the fuel pressure regulator return line to a separate tank/canister and observe the flow rate.
Forum: 928 Forum
09-23-2018, 01:32 AM
Replies: 106
Views: 5,262
Posted By ptuomov

Robís, yes. But Iíve got another one with an...

Robís, yes. But Iíve got another one with an open differential.
Forum: 928 Forum
09-22-2018, 06:30 PM
Replies: 106
Views: 5,262
Posted By ptuomov

At what measured surface hardness are steel gears...

At what measured surface hardness are steel gears usually the toughest in terms of their ability to hold load? 400 Brinell?
Forum: 928 Forum
09-22-2018, 02:08 PM
Replies: 114
Views: 5,332
Posted By ptuomov

A single Aeromotive pump isn’t going to get it...

A single Aeromotive pump isn’t going to get it done, in my opinion. This is not a carbureted normally aspirated engine, it’s a boosted fuel injected engine. The pump needs to be able to flow against...
Forum: 928 Forum
09-22-2018, 02:02 PM
Replies: 114
Views: 5,332
Posted By ptuomov

Iíd say that this depends on how high rpms that...

Iíd say that this depends on how high rpms that engine spun. Also, how drivable the engine needed to be at part throttle and low rpms.

Itíll be interesting to see what Greg Grayís 2-valve engine...
Forum: 928 Forum
09-20-2018, 01:29 PM
Replies: 114
Views: 5,332
Posted By ptuomov

The Simard engine makes about 107 estimated crank...

The Simard engine makes about 107 estimated crank hp and about 91 measured rear wheel hp per liter and it runs safely on 93 octane pump gas.
Forum: 928 Forum
09-20-2018, 07:03 AM
Replies: 114
Views: 5,332
Posted By ptuomov

Carl -- Your signature line says "Builder of the...

Carl -- Your signature line says "Builder of the most powerful Naturally Aspirated 928 engine, 602 HP, 510 lb ft Torque Nov 2017". How does that claim square with Mike Simard's engine making 640 hp...
Forum: 928 Forum
09-18-2018, 04:29 PM
Replies: 106
Views: 5,262
Posted By ptuomov

Let me know what you get. Right now, the most...

Let me know what you get. Right now, the most pressing need is for an '87-89 LSD unit.
Forum: 928 Forum
09-18-2018, 01:22 PM
Replies: 106
Views: 5,262
Posted By ptuomov

PING! f someone has used 87-88 LSD unit in good...

PING! f someone has used 87-88 LSD unit in good condition for sale (part number 92833205220), I'm interested in buying it.
Forum: 928 Forum
09-17-2018, 06:14 PM
Replies: 114
Views: 5,332
Posted By ptuomov

At 0.5 BSFC, 8x80 lbs injectors will totally make...

At 0.5 BSFC, 8x80 lbs injectors will totally make it even at the rated pressure, simple arithmetic says the limit is at 1280 hp at 100% duty cycle and 1216 hp at 95% duty cycle.

And they will...
Showing results 1 to 25 of 499
 


 
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