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Search found 1336 matches

by Dan Timberlake
Tue Sep 14, 2021 4:15 pm
Forum: Engine Tech
Topic: Can a steel flywheel be machined?
Replies: 22
Views: 740

Re: Can a steel flywheel be machined?

Is the 15# (cast) ductile iron L-88 flywheel SFI approved ?

https://sdparts.com/i-19932898-chevrole ... gJ7S_D_BwE
by Dan Timberlake
Thu Aug 12, 2021 2:15 am
Forum: Engine Tech
Topic: heptadecagonal hone job - Howdy Doo-it ?
Replies: 18
Views: 1115

heptadecagonal hone job - Howdy Doo-it ?

.010" O/S LS something or other. 4.016"Ø +/-. Details of what actual hone was used to create the O/S bores are unknown. The regular vertical "stripes" sort of line up with the piston's oil ring drain holes. I've seen 1000 CC iron cylinder Harley sportsters wear with stripes like that at the head bol...
by Dan Timberlake
Sun Aug 01, 2021 2:49 pm
Forum: Engine Tech
Topic: adjustable or 10-15 psi oil warning light switch - also 30 psi low fuel pressure switch.
Replies: 5
Views: 347

adjustable or 10-15 psi oil warning light switch - also 30 psi low fuel pressure switch.

A few decades back some (Bosch?) oil pressure switch had the rep for having a set point higher than the typical very low maybe 3 psi "light on " pressure. Does such a thing exist today? Also, a switch that kicked "on" at 30-35 psi would be handy for fuel injected cars. The Stewart Warner 5000 Series...
by Dan Timberlake
Tue Jul 27, 2021 7:01 pm
Forum: Engine Tech
Topic: 2004 chrysler 2.7 "sludging"
Replies: 5
Views: 496

2004 chrysler 2.7 "sludging"

We are going to buy a real nice 68,000 mile Chrysler Sebring convertible for too much money. 2.7 V-6 which is the notorious sludging engine. The engine oil looks well used, like nobody was trying to hide anything. A peek under the oil filler looks real good. One of the sludging rumors is the 2.7 wat...
by Dan Timberlake
Tue Jul 27, 2021 6:40 pm
Forum: Engine Tech
Topic: LS 3 liner OD gaps
Replies: 8
Views: 611

LS 3 liner OD gaps

A bud just bought a used stroked LS3 short block pig-in-a-poke for a real good price. .010" over I think. Most of it looks real good, but a local shop commented on a gap visible on the deck around all 8 liners. That shop claimed the gaps are a sign the OEM liners have shifted or even dropped. Refer ...
by Dan Timberlake
Sat Jul 17, 2021 3:43 pm
Forum: Engine Tech
Topic: offset wrist pins
Replies: 8
Views: 655

Re: offset wrist pins

Reversing offset was also a fairly standard practice in the MOPAR Performance/Direct Connection tech papers for all engine families.
A little power at the expense of noise.

I'd be prepared for the possibility of some risk of un-intended consequences with an early days unsophisticated knock sensor.
by Dan Timberlake
Wed Jun 30, 2021 7:15 pm
Forum: Engine Tech
Topic: AMC 401 Intake Manifold MPG
Replies: 12
Views: 729

Re: AMC 401 Intake Manifold MPG

SAE paper 720124 "Design. Refinement of Induction and Exhaust Systems Using Steady-State Flow Bench Techniques" by American Motors is lots of fun. There are some suggestions about how to simultaneously improve flow performance AND improve mixture quality with the "corner" in the intake where the ver...
by Dan Timberlake
Tue Jun 08, 2021 6:16 pm
Forum: Engine Tech
Topic: Why are these holes made in crankshafts?
Replies: 27
Views: 1802

Re: Why are these holes made in crankshafts?

The OP's picture looks to be an inline four, so not bob weighted while balancing.

So the holes in the rod journal throws might make the minimal counterweights less skimpy.
by Dan Timberlake
Mon May 31, 2021 10:29 am
Forum: Engine Tech
Topic: Wet Blasting engine parts
Replies: 4
Views: 595

Re: Wet Blasting engine parts

Granted, the cleaning the entire blasted part is different than trying to mask off all the holes in an open engine.

But GM is mighty concerned about the debris from those surface conditioning disks.

https://static.nhtsa.gov/odi/tsbs/2017/ ... 1-9999.pdf
by Dan Timberlake
Sat Apr 24, 2021 1:40 pm
Forum: Engine Tech
Topic: Issue trying to set total timing
Replies: 14
Views: 538

Re: Issue trying to set total timing

Yeah, I don't see how any timing light can ignore or make sense of what goes on inside the plug lead run by a multi spark ignition.
But I'll be 71 year old tomorrow.
by Dan Timberlake
Sat Apr 17, 2021 8:25 am
Forum: Engine Tech
Topic: How Can Dual Exhaust Ports Be Made Into A Genuine Performance Option For 2 Valve Heads?
Replies: 20
Views: 602

Re: How Can Dual Exhaust Ports Be Made Into A Genuine Performance Option For 2 Valve Heads?

biological organisms prefer symmetry. ....................... =========== hmmmm. I only have one exhaust port. Then there is this, which about half the human population under 24 actively "prefers" about 18 times per day. https://visualsonline.cancer.gov/retrieve.cfm?imageid=8262&dpi=72&fileformat=j...
by Dan Timberlake
Mon Apr 05, 2021 7:17 pm
Forum: Engine Tech
Topic: Crankshaft grinding 101
Replies: 24
Views: 1379

Re: Crankshaft grinding 101

3.000" stroke. 1° is approximately .026" of centerline shift of the rod journal. So the rod journal would have to be ground .03" undersize "sideways" to correct 1° of index.

It also makes me wonder how much decent OEM cranks actually varied yesteryear.
by Dan Timberlake
Sun Mar 21, 2021 11:32 am
Forum: Engine Tech
Topic: Timing belt tensioner
Replies: 6
Views: 305

Re: Timing belt tensioner

by Dan Timberlake
Sat Feb 27, 2021 10:35 am
Forum: Engine Tech
Topic: Crack are what????
Replies: 35
Views: 2500

Re: Crack are what????

The ones tiny sharp points originating in the journal fillets/radiuses sure look like the final stages of big trouble. The the broad buzzy ones just look strange. Kind of like a vibrating engraver's work. $30 of LPT / dye penetrant chemicals would help decide. Good for extracting confessions from st...
by Dan Timberlake
Sat Feb 27, 2021 10:27 am
Forum: Engine Tech
Topic: Main Caps Loose in Registers
Replies: 7
Views: 2100

Re: Main Caps Loose in Registers

Depending on how loose, I'd say staking to tighten register fits needs to be done with a bore gage close at hand. My concern is inducing "cap shift" of .001" or maybe even more. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQt4t1eTUcHZWjZ8WKg7Per8yQXyg-3je5XMQ&usqp=CAU With modern bearings t...