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Search found 427 matches

by williamsmotowerx
Tue Mar 03, 2020 10:55 am
Forum: Engine Tech
Topic: Land and Sea Dynos????
Replies: 10
Views: 1691

Re: Land and Sea Dynos????

Does anyone have any info or wiring diagram of the RPM pickup?

It's for an inertia dyno. Pickup for the drum.

Normally open? Normally closed?
by williamsmotowerx
Mon Mar 02, 2020 3:14 pm
Forum: Engine Tech
Topic: Best race valve material
Replies: 35
Views: 2746

Re: Best race valve material

here is a plot of a 7mm valve with the seat insert 0.002" offset from the valve seat the nominal seat pressure induces a stress of 25MPA, bending increases that to 54Mpa when it has found its natural settling position which is nowhere near enough of an alternating stress to induces any kind of fatig...
by williamsmotowerx
Mon Feb 24, 2020 8:31 pm
Forum: Engine Tech
Topic: Best race valve material
Replies: 35
Views: 2746

Re: Best race valve material

N20mike is on the money. Usually not concentricity.

It's usually worn valve guides or cams that have design flaws around max lift. Causes valve to whip
by williamsmotowerx
Thu Feb 20, 2020 10:49 pm
Forum: Engine Tech
Topic: DTS dyno surge
Replies: 14
Views: 1401

Re: DTS dyno surge

Sounds like a bad rpm pickup sensor. Is there one on the brake?
by williamsmotowerx
Wed Dec 04, 2019 3:26 pm
Forum: Engine Tech
Topic: Free - hi-tech 5-75 hp dyno
Replies: 19
Views: 1696

Re: Free - hi-tech 5-75 hp dyno

Tried sending you an email. This is perfect for my size engines.
by williamsmotowerx
Fri Oct 04, 2019 2:24 pm
Forum: Engine Tech
Topic: Blow-by curve
Replies: 22
Views: 3535

Re: Blow-by curve

Run it with 2 stroke oil in the fuel. 32:1 or 24:1. See if that helps. Would be a fun quick test

I didn't even notice this was a super old post... my bad
by williamsmotowerx
Mon Sep 23, 2019 1:44 pm
Forum: Engine Tech
Topic: Theory of 4 valve poly quad cylinder heads.
Replies: 98
Views: 4455

Re: Theory of 4 valve poly quad cylinder heads.

Production GSXR Suzuki's had a service bulletin and special tool to check squish in early 90's.

If it was .028" you were good. If it was .026" you had to put a new head gasket on.

So yes, there was some tight squish stock
by williamsmotowerx
Wed May 15, 2019 6:56 pm
Forum: Shop Equipment - For Sale or Wanted
Topic: Land and sea dyno for sale
Replies: 1
Views: 835

Re: Land and sea dyno for sale

FYI, this dyno is capable of up to 300hp.

It comes with an test stand, or can be used directly on the end of a snowmobile tapered crankshaft.
by williamsmotowerx
Tue May 14, 2019 3:09 pm
Forum: Shop Equipment - For Sale or Wanted
Topic: Land and sea dyno for sale
Replies: 1
Views: 835

Land and sea dyno for sale

Land and sea dyno 9" water brake.

Full dyno, water tank, computer. $5800.

williamsmotowerx@gmail.com

Email me, will send pics
by williamsmotowerx
Tue Sep 04, 2018 6:02 pm
Forum: Engine Tech
Topic: cordless impact wrenches & drivers
Replies: 24
Views: 2568

Re: cordless impact wrenches & drivers

Ryobi. They're amazing and cheap. I use my 1/4 and 1/2 everday for 7 plus years. Just recently had to buy new batteries. Ryobi has best prices on batteries too.
by williamsmotowerx
Wed Aug 29, 2018 11:46 am
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 11047

Re: How are limitations of dwell over nose estimated?

What happened to page 10? There was a bunch of posts deleted?
by williamsmotowerx
Tue Aug 28, 2018 2:32 pm
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 11047

Re: How are limitations of dwell over nose estimated?

Dwelling over the nose is the most stressful thing you can do to a valvetrain.

You see it all the time in cam grinders who try to manipulate a copied cam.
by williamsmotowerx
Tue Jul 24, 2018 2:00 am
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 11047

Re: How are limitations of dwell over nose estimated?

And obviously you've never designed a cam or measured one.

Those are not infinite design errors. Those graphs are of a measured cam. Those that have ground a cam or designed a cam know exactly what's going on in the "not smoothed enough" graphs
by williamsmotowerx
Tue Jul 24, 2018 1:40 am
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 11047

Re: How are limitations of dwell over nose estimated?

As designed you don't you smoothing.

When you measure a cam as ground, you use smoothing sparingly to interpret the profile.

When you have a spike at peak lift it's the cam dwelling. Which causes the valve head to shake like a cold chihuahua. Pop goes the daisy
by williamsmotowerx
Tue Jul 24, 2018 1:16 am
Forum: Engine Tech
Topic: How are limitations of dwell over nose estimated?
Replies: 136
Views: 11047

Re: How are limitations of dwell over nose estimated?

joe 90 wrote:
Tue Jul 24, 2018 12:45 am
Acceleration is ALWAYS zero when at peak lift and zero velocity. So due to the sampling rate and lack of smoothing, that part is wrong.
Lack of smoothing? Why do you need smoothing for zero movement?

That's what you're saying when you have zero accel and velocity.