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Search found 1272 matches

by Dan Timberlake
Sat Jul 11, 2020 2:34 pm
Forum: Engine Tech
Topic: Piston ring side (axial) clearance - higher than spec?
Replies: 10
Views: 422

Re: Piston ring side (axial) clearance - higher than spec?

If the rings really had that much side clearance I'd speculate there'd be problems with ring sealing and even oil control. MAybe even "ring life." The prehistoric factory wear limits of 0.006" or so was for for ring groove wear which is probably "worse" than .006" clearance in a "perfect" groove. In...
by Dan Timberlake
Sat Jul 04, 2020 4:15 pm
Forum: Engine Tech
Topic: LS1 lifter and cam distress
Replies: 0
Views: 104

LS1 lifter and cam distress

A colleague bought a used GTO LSI several years back to install in his MAzda. INstalled as-was. After about 20,000 happy miles, valve train noise seemed to be rapidly increasing. A top end investigation revealed all the rollers still turning freely. Beehive springs of unknown origin, and Pushrods et...
by Dan Timberlake
Sat Jul 04, 2020 3:43 pm
Forum: Engine Tech
Topic: Steel Main cap material
Replies: 25
Views: 880

Re: Steel Main cap material

What do the stock caps do wrong? If breakage is a problem, do you have any pictures of typical broken caps ? 'Most all steel will have the same stiffness. The important material property is E, or modulus of elasticity. E of all steels are ~ 30,000,000 psi. E of Cast iron varies considerably. From 10...
by Dan Timberlake
Mon Jun 29, 2020 7:04 pm
Forum: Engine Tech
Topic: Severe engine overheat = now overheating oil???
Replies: 18
Views: 524

Re: Severe engine overheat = now overheating oil???

The couple of engines I've known that had low oil pressure only after warming up each had excessive bearing clearances. Like, down to the copper. The rod bearings often suffer first, so the inspection of a few main bearings might have missed that. I don't understand the cam bearings "squishing", but...
by Dan Timberlake
Sat Jun 27, 2020 10:54 am
Forum: Engine Tech
Topic: Used Cam
Replies: 17
Views: 952

Re: Used Cam

Well I just finished cleaning the cam up in the lathe using some scotchbrite and then indicated every lobe. All looks to spec. I might just run it with a new set of lifters. Perhaps a local auto machine shop that grinds cranks can help. Most that grind cranks also have a belt polisher. Worth a call...
by Dan Timberlake
Sat Jun 27, 2020 10:44 am
Forum: Engine Tech
Topic: Painted Connecting Rods?
Replies: 20
Views: 1233

Re: Painted Connecting Rods?

Kevin, i was thinking hand sanding w/ 320-400-600. If you look at a Carrillo, Oliver, Crower, or Pankl that has been shot peened the surface is really not very rough. It is most likely a waste of time anyway ?? Mark H. The dimples will be shallower on rods made of harder steel. My recollection is m...
by Dan Timberlake
Sat Jun 27, 2020 10:37 am
Forum: Engine Tech
Topic: Painted Connecting Rods?
Replies: 20
Views: 1233

Re: Painted Connecting Rods?

Here is a question i have.....Is it OK to polish a steel piece such as the sides of a shot peened steel H-Beam Con-Rod :?: Mark H ===========. If the part is properly shot peened then polishing is OK ONLY if less than 10% of the compressed layer is removed. This 10% limit on material removal after ...
by Dan Timberlake
Sat Apr 18, 2020 1:14 pm
Forum: Engine Tech
Topic: Chatter marks on main bearings
Replies: 11
Views: 994

Re: Chatter marks on main bearings

What engine ?

Visually the finish of the cap parting face is mighty ruff. Reminds me of Chevy rod cap machining in the 60s and 70s, unless you bought the "pink" rods.
by Dan Timberlake
Sun Mar 29, 2020 4:15 pm
Forum: Engine Tech
Topic: interesting header-exhaust port alignment on Honda "Fireblade" engine
Replies: 5
Views: 764

interesting header-exhaust port alignment on Honda "Fireblade" engine

https://news.webike.net/wp-content/uploads/2019/11/191112_05-680x454.jpg https://moto7.net/imgs/honda-cbr1000rrr-32.jpg Cross section drawings presumably from the factory don't match the pictues of the cut-away show job engine. https://www.hondaprokevin.com/pictures/2021-cbr1000rr-r-sp-rd/2021-honda...
by Dan Timberlake
Wed Mar 25, 2020 12:38 pm
Forum: Engine Tech
Topic: calculating bob weight
Replies: 27
Views: 17889

Re: calculating bob weight

Yess, yess- old thread. But right on the spot in what I just needed. Data input. Piston: 452g Pin: 117g Rings and Locks: 41g Rod small end: 232g Rod big end: 368g 38 + 368 +(232+41+117+452)/2 I end up With using formula above...? Cannot be right... Online website, "Performance engine Tech" http://w...
by Dan Timberlake
Wed Mar 18, 2020 1:02 pm
Forum: Engine Tech
Topic: Lighten an I - beam rod
Replies: 20
Views: 1520

Re: Lighten an I - beam rod

https://youtu.be/bThiGTY0-wA This is video of a shop lightening a connecting rod =============. At 5:46 it looks like the finished rod will have : - Seriously degraded fatigue strength due to the removal of the curved rib that wraps around the bolt head. - Significantly reduced "foot print" at the ...
by Dan Timberlake
Mon Mar 16, 2020 12:47 pm
Forum: Engine Tech
Topic: detailed parts list for direct swap of old GM Vortec heads onto a '78 Gen 1 400 block
Replies: 6
Views: 910

Re: detailed parts list for direct swap of old GM Vortec heads onto a '78 Gen 1 400 block

The owner put some thought into compression for the street, and bought some KB pistons with a useful volume of dish ( according to the catalog ).

thanks for all the help.

Dan T
by Dan Timberlake
Mon Mar 16, 2020 12:44 pm
Forum: Engine Tech
Topic: Heavy metal welding
Replies: 10
Views: 1063

Re: Heavy metal welding

I don't think "welding" fuses with Tungsten/mallory metal.
At best the weld fillet creates a mechanical ridge around the steel hole to retain the Mallory.
The Mallory slug has to be set below the surface, or heavily chamfered.

// Maybe // TIG Bronze actually sticks. Or, maybe not.
by Dan Timberlake
Fri Mar 13, 2020 12:43 pm
Forum: Engine Tech
Topic: detailed parts list for direct swap of old GM Vortec heads onto a '78 Gen 1 400 block
Replies: 6
Views: 910

detailed parts list for direct swap of old GM Vortec heads onto a '78 Gen 1 400 block

I've been surfing this subject for a year or 2 now and am surprised I have not been able to find enough information yet. I know about steam holes, and checking for accessory mount holes on the heads, and that a new intake is needed. Head bolts are one question. I sheepishly admit I have not explored...
by Dan Timberlake
Sun Mar 08, 2020 10:27 am
Forum: General Tech
Topic: Are David vizard’s books still relevant today?
Replies: 13
Views: 1908

Re: Are David vizard’s books still relevant today?

30362760637.jpg I wonder what would survive from the 1973 edition if DV were to revise it today. It seems to me Rick Stetson had a copy of TaPoCHM and applied it to fine effect( along with thoughtful development and tuning skills) on his Honda "750" drag bikes back in the last millenium. https://www...