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Search found 48 matches

by Rick!
Sun Oct 13, 2019 7:31 pm
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 1039

Re: Artificial Intelligence to Design Lightweight Parts

https://www.speed-talk.com/forum/download/file.php?id=22759&mode=view Just like in most cases of smart solutions that I have experienced, great ideas typically converge on very similar solutions. Case in point, this optimized rocker arm. Using good fundamentals, the same answer can be reached throu...
by Rick!
Thu Oct 10, 2019 9:10 am
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 1039

Re: Artificial Intelligence to Design Lightweight Parts

It appears I spoke too soon, the pickle fork is showing cracks on 37ng’s.

Back to AI rockers...
by Rick!
Thu Oct 10, 2019 7:07 am
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 1039

Re: Artificial Intelligence to Design Lightweight Parts

Except for the 737 MAX To what specifically do you attribute the problem of the 737MAX? Given the development cycle of a Jet, the software Boeing uses (primarily CATIA) latency of version updates, latency of training, incorporation of technology. There is unlikely to be any parts on one designed wi...
by Rick!
Tue Oct 08, 2019 3:51 pm
Forum: Engine Tech
Topic: Do pushrods generally bend in the middle or near the lifter end?
Replies: 10
Views: 521

Re: Do pushrods generally bend in the middle or near the lifter end?

Get several pop cans. Step on one and then doink it with your finger. Repeats steps one and two by poking the can at a different height on the can. It will buckle pretty close to where the eccentric load is applied. A pushrod that doesn't see eccentric loading "usually" buckles in or near the middle...
by Rick!
Tue Oct 08, 2019 2:05 pm
Forum: Chassis / Suspension / Body
Topic: 4130 chromoly tube
Replies: 6
Views: 422

Re: 4130 chromoly tube

The easiest method to use for getting tubing you desire is to ask for a copy of the material certs along with the "heat" batch they came from. If tensile, yield and elongation line up with your needs, you're golden. Having a Ryerson catalog and ASTM A513 and A519 specs go a long way in being able to...
by Rick!
Sat Oct 05, 2019 6:59 pm
Forum: Engine Tech
Topic: Small diesel engine turbo selection help.
Replies: 14
Views: 451

Re: Small diesel engine turbo selection help.

http://www.competitiondiesel.com/forums ... 59466.html

Basically copy what folks have done with the 3 cylinder Yanmar for turbos.

It seems the JD430 lawn tractor might also be a reference for a turbo mod. The JD3038 is a 1.5l yanmar turbo, for reference.
by Rick!
Tue Oct 01, 2019 1:33 pm
Forum: Engine Tech
Topic: Did Penn Grade 1 change their formula?
Replies: 30
Views: 1624

Re: Did Penn Grade 1 change their formula?

https://www.pca.org/story-behind-drivens-new-gp-1-oils Did DA Lubricants change their formula around first part of 2019? I also found some posts on YB stating that DA lubricants has stopped getting their base oil from ARG refinery and the additive package they used from Lubrizol has been discontinu...
by Rick!
Mon Sep 30, 2019 8:09 am
Forum: Engine Tech
Topic: Service Life of Steel H-Beam Rods
Replies: 31
Views: 1381

Re: Service Life of Steel H-Beam Rods

---this left side picture is a Carrillo rod with one crack---and the second picture is a Carrillo rod with 3 cracks between the red marks. ---two different engines from good late model stock car 8000rpm engines in the late 1970's. ---both engines had two full seasons of short oval track racing. ---...
by Rick!
Mon Sep 23, 2019 10:50 am
Forum: Engine Tech
Topic: Pennzoil 20w50 Racing Oil
Replies: 17
Views: 1511

Re: Pennzoil 20w50 Racing Oil

The Pennzoil 20w50 racing oil was very popular in our area. Engine wear on disassembly was minimal. Ring sell after builds was good with no foaming issues. Now the problem is a good replacement. Any suggestions without breaking the bank. Still looking for Pennzoils reason for discontinuing producti...
by Rick!
Fri Sep 13, 2019 9:19 pm
Forum: Engine Tech
Topic: Torque To Yield
Replies: 30
Views: 938

Re: Torque To Yield

pretty much all TTY bolts i've used are necked down over a defined length. so you cant always say it generates more clamp simply because the stress is higher as the cross section where it yields is smaller so you need to account for that. its normally done to have better visibility whether stretch ...
by Rick!
Thu Sep 12, 2019 7:27 am
Forum: Engine Tech
Topic: Torque To Yield
Replies: 30
Views: 938

Re: Torque To Yield

A couple of pieces of mis-information above. Corrections below: 1. Torque to yield bolts are designed to be torqued beyond their elastic limit and into their plastic range. This means they will not return to their original length after disassembly. 2. "Torque plus angle" bolts are usually but not n...
by Rick!
Mon Sep 09, 2019 2:40 pm
Forum: Engine Tech
Topic: Theory of 4 valve poly quad cylinder heads.
Replies: 98
Views: 3230

Re: Theory of 4 valve poly quad cylinder heads.

Look to see if any modern high performance motorcycle engines are biasing flow that was not done for packaging reasons. They test an unimaginable array of parameters with the best of equipment. If they are not doing it, it is unlikely to be worth doing. Though DV's patented system is novel, if it w...
by Rick!
Sun Sep 08, 2019 12:32 pm
Forum: Engine Tech
Topic: Freezing tri metal bearings with Liquid Nitrogen
Replies: 24
Views: 1021

Re: Freezing tri metal bearings with Liquid Nitrogen

One Factor is you don't know the actual aluminum alloy, does sand cast or die cast or forged or plate aluminum all expand the same? I believe it's a decision based on actual experience, some of which has been expressed here.... Since it's an engine case, one can safely assume it is not plate or for...
by Rick!
Sun Sep 08, 2019 9:32 am
Forum: Engine Tech
Topic: Freezing tri metal bearings with Liquid Nitrogen
Replies: 24
Views: 1021

Re: Freezing tri metal bearings with Liquid Nitrogen

Doing some back of the napkin calcs using each material's coefficient of thermal expansion: CTE (Coefficient of thermal expansion) CTE Aluminum, assumed to be 356T6: 2.32E-5 inch/(inch•Rankine) or m/(m•K) if you like SI units CTE Steel; most steels are very similar: 1.13E-5 inch/(inch•Rankine) Ssinc...
by Rick!
Thu Sep 05, 2019 12:40 pm
Forum: Engine Tech
Topic: Lofting, light load overrev, pushrod mechanics
Replies: 8
Views: 627

Re: Lofting, light load overrev, pushrod mechanics

What rockers? We always had problems with the solid aluminum rockers "no roller bearing" style, that would constantly be eating pushrods, adjusters and rocker bodies deforming turning 8000. Eventually went to a set of jesel rockers to eliminate the problem. T&D aluminum rollers, shaft mounted, indi...