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Search found 5920 matches

by Kevin Johnson
Wed Nov 20, 2019 10:21 am
Forum: Engine Tech
Topic: Rod side clearance oil squirting?
Replies: 9
Views: 281

Re: Rod side clearance oil squirting?

The “nozzle” geometry is such that the rod side slots are much more likely to be oiling bore walls, not cooling pistons. The piston cooling oil spray needs a relatively narrow spray pattern and high flow rate. The same quantity of oil is being released from the bearing margins regardless. The slot(...
by Kevin Johnson
Wed Nov 20, 2019 1:46 am
Forum: Engine Tech
Topic: Vacuum for vac u pan
Replies: 6
Views: 183

Re: Vacuum for vac u pan

In his BBC book, David Vizard wrote about and showed a system he said was by far the best pan vac. he's ever seen. I forget the builder's name, but I believe he is/was a Speed-Talker. The system used a square cut ~ 5/8" tube angled in through the side of the merge collector and bending to run down ...
by Kevin Johnson
Wed Nov 20, 2019 1:30 am
Forum: Engine Tech
Topic: Rod side clearance oil squirting?
Replies: 9
Views: 281

Re: Rod side clearance oil squirting?

Honda even used two per side.

Image
by Kevin Johnson
Mon Nov 18, 2019 2:20 pm
Forum: Engine Tech
Topic: Old 4v head, modifying for tumble and velocity vs flow
Replies: 7
Views: 474

Re: Old 4v head, modifying for tumble and velocity vs flow

So I'm looking at my current car powered by a 4G94 with its head design from the early 90s I may be able to help if I knew what make a 4G94 head was off. DV https://en.wikipedia.org/wiki/Mitsubishi_4G9_engine Kevin, Thanks, My memory is still a little blotchy here. The head I modified using the Pol...
by Kevin Johnson
Mon Nov 18, 2019 8:51 am
Forum: Engine Tech
Topic: Staggered main clearance inline 6
Replies: 17
Views: 1935

Re: Staggered main clearance inline 6

The differing clearances can help in transforming vibrational energy into heat rejected into the coolant (oil flow). Dedicated crankshaft dampeners often do this with high molecular weight silicone fluids or various polymers. Hi Kevin, Is your theory that greater ( or lesser) clearance provides mor...
by Kevin Johnson
Mon Nov 18, 2019 5:54 am
Forum: Forum Help / Questions / Tips
Topic: Server times out
Replies: 34
Views: 403

Re: Server times out

Hi Harry (and others), You really need to print out or copy the instructions below to solve the problem. I just performed the "trace route" with my computer (which accesses the site successfully all(?) the time). If you talk to your internet provider tech service this is probably what they will ask ...
by Kevin Johnson
Mon Nov 18, 2019 5:05 am
Forum: Engine Tech
Topic: Valve springs discoloured
Replies: 4
Views: 371

Re: Valve springs discoloured

WAG
Two different manufacturers producing a specified spring for a distributor, each with a different formula coating.
by Kevin Johnson
Sun Nov 17, 2019 9:44 pm
Forum: Engine Tech
Topic: Old 4v head, modifying for tumble and velocity vs flow
Replies: 7
Views: 474

Re: Old 4v head, modifying for tumble and velocity vs flow

David Vizard wrote:
Sun Nov 17, 2019 9:16 pm
So I'm looking at my current car powered by a 4G94 with its head design from the early 90s

I may be able to help if I knew what make a 4G94 head was off.
DV
https://en.wikipedia.org/wiki/Mitsubishi_4G9_engine
by Kevin Johnson
Sun Nov 17, 2019 3:58 pm
Forum: Forum Help / Questions / Tips
Topic: Server times out
Replies: 34
Views: 403

Re: Server times out

https://www.key-systems.net/de/unternehmen/unsere-hunde

The dogs will track down the problem. :)
by Kevin Johnson
Sun Nov 17, 2019 3:13 am
Forum: Engine Tech
Topic: LS trunnion upgrades & longevity
Replies: 19
Views: 572

Re: LS trunnion upgrades & longevity

modok wrote:
Sun Nov 17, 2019 3:11 am
indeed it is tapered.
Although I think the K shape would work well for a rocker bushing also.
Rocker bushings could be tapered, since main load is one sided, but maybe that's another subject? :wink:
I like "K" but then I am biased.
by Kevin Johnson
Sun Nov 17, 2019 3:05 am
Forum: Engine Tech
Topic: LS trunnion upgrades & longevity
Replies: 19
Views: 572

Re: LS trunnion upgrades & longevity

The insert is not regularly shaped (kinda like conic sections but obliquely through the cylindrical shape). It will only fit the small end in one way correctly and the notches are to control the insertion exactly.

(I say this because it appears that the small end is tapered.)
by Kevin Johnson
Sat Nov 16, 2019 8:21 pm
Forum: Engine Tech
Topic: Staggered main bearing sizes vintage GM
Replies: 24
Views: 2438

Re: Staggered main bearing sizes vintage GM

I think "squeeze film" damping typically refers to radial damping. ... Yes, typically. However I saw that there is also a large literature on the shifting of journals due to torsionally induced bending of the crankshaft. If you can reject the torsional energy by heat generation in the oil film that...
by Kevin Johnson
Sat Nov 16, 2019 2:56 pm
Forum: Engine Tech
Topic: Staggered main bearing sizes vintage GM
Replies: 24
Views: 2438

Re: Staggered main bearing sizes vintage GM

I think "squeeze film" damping typically refers to radial damping. ... Yes, typically. However I saw that there is also a large literature on the shifting of journals due to torsionally induced bending of the crankshaft. If you can reject the torsional energy by heat generation in the oil film that...
by Kevin Johnson
Sat Nov 16, 2019 2:09 pm
Forum: Engine Tech
Topic: Do electric turbo chargers work???
Replies: 18
Views: 852

Re: Do electric turbo chargers work???

The first electric supercharger I saw was in 1962. A guy I knew decided against my advice to hook up his heater blower to the aircleaner snorkel of his Austin Healy. Later i asked him how it had worked. "Not wortha s**t!" #-o My Dad picked up some kind of surplus industrial electric supercharger in...
by Kevin Johnson
Sat Nov 16, 2019 11:19 am
Forum: Engine Tech
Topic: Mikuni carbs vs. injected ITBs
Replies: 29
Views: 645

Re: Mikuni carbs vs. injected ITBs

[ US Market Year Model Max Bhp Max Torque 1962 MGB 94 @ 5500 107 @ 3500 1973 MGB 79 @ 5350 94 @ 3000 I think the claim is merely that proper performance-tuned Mikunis will improve a later MGB with emissions tuned factory SUs. Amazingly enough the above difference is 15hp. 1973 may have been subject...