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Search found 627 matches

by Circlotron
Tue Oct 08, 2019 6:59 pm
Forum: Engine Tech
Topic: flywheel to balancer weight proportion- inline 6
Replies: 48
Views: 1526

Re: flywheel to balancer weight proportion- inline 6

Building an inline 6 and will follow this thread with interest. Have a question...... Regarding overall flywheel weight as opposed to torsional dampner weight...... Is overall flywheel weight inclusive of clutch disc and pressure plate, as well? In my view, it would seem so. Thanks, Harry I think o...
by Circlotron
Wed Oct 02, 2019 9:59 pm
Forum: Engine Tech
Topic: Anyone evr reverse cooled an ls engine?
Replies: 8
Views: 730

Re: Anyone evr reverse cooled an ls engine?

I did read an engineering paper once where the researcher got an old 1200cc pushrod Corolla engine and made up a special head gasket that blocked the coolant holes, and with a bit of external plumbing ran the block at normal temp and the head quite cold. Two completely separate cooling circuits. Can...
by Circlotron
Wed Oct 02, 2019 9:50 pm
Forum: Engine Tech
Topic: Coating Air cooled pistons
Replies: 37
Views: 1082

Re: Coating Air cooled pistons

As a corollary, the less heat is lost to the piston or chamber, the more is available to do work. But the expansion ratio on the power stroke remains the same so I'd expect higher gas temp at the top of the stroke and higher at the bottom, leading to higher exhaust temp but no real increase in effi...
by Circlotron
Wed Sep 18, 2019 10:47 pm
Forum: Engine Tech
Topic: about a Nitro cackle engine
Replies: 33
Views: 1775

Re: about a Nitro cackle engine

Dave Koehler wrote:
Wed Sep 18, 2019 10:25 pm
Got Zoomies?
Make them same diameter as a full tilt top fuel engine. Don't worry about port matching. The diameter of a tube greatly affects the sound. N/A means no blower belt whine if course. :?
by Circlotron
Tue Sep 10, 2019 9:44 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 116
Views: 3129

Re: Low speed (1500-1800 RPM) driveability issue

What plug gaps?
Wider gaps may help to reduce this problem.
No cost to try.
by Circlotron
Fri Sep 06, 2019 12:12 am
Forum: Engine Tech
Topic: Air/ fuel ratio data logger
Replies: 27
Views: 1319

Re: Air/ fuel ratio data logger

Maybe just use a simple gauge and somehow duct tape your phone in front of it and take a video during the run. Bonus is a sound recording. Some of those gauges have a multiplexed display though, and the shutter speed of the camera taking a video makes the number segments look a bit weird because the...
by Circlotron
Thu Sep 05, 2019 1:43 am
Forum: Engine Tech
Topic: Making a muffler
Replies: 322
Views: 49338

Re: Making a muffler

The basic problem with a 4in straight through muffler is that a lot of the exhaust gas can go right down the middle and not get exposed to the sound absorbing material. You want the most amount of surface area for a give cross sectional area. Is there a straight through muffler where the perforated...
by Circlotron
Thu Aug 29, 2019 1:29 am
Forum: Engine Tech
Topic: Injector timing
Replies: 19
Views: 598

Re: Injector timing

High impedance injectors are like the relay coil you suggest. Low impedance injectors are in effect a low voltage injector. You apply full battery voltage for just the briefest moment to make it open really fast then back off the effective voltage once it has opened. If you maintain full voltage whi...
by Circlotron
Wed Aug 28, 2019 9:00 pm
Forum: Engine Tech
Topic: Injector timing
Replies: 19
Views: 598

Re: Injector timing

... so what do they use for the injector switch: MOSFET, BIPOLAR, SCR ??? How do they protect from inductive kickback diode/resistor/coil .. in other words what do the injector switching circuits look like ??? So far I have not been able to find out ... I haven't played with injectors but I have me...
by Circlotron
Wed Aug 28, 2019 8:51 pm
Forum: Engine Tech
Topic: Improved engine throttle responce
Replies: 23
Views: 1235

Re: Improved engine throttle responce

For a certain amount of time the accelerator pump shot is going to impinge on the back of the throttle blade anyway, then dribble across and leave at the edge. What was atomised becomes liquid again when it hits the throttle blade. Even what comes out of the booster venturi has this issue at part th...
by Circlotron
Mon Aug 26, 2019 11:20 pm
Forum: Engine Tech
Topic: Injector timing
Replies: 19
Views: 598

Re: Injector timing

2: on engine braking the ECU cuts the fuel completely but if you "blip" the throttle as you do on down change on a bike then it stalls cos there is absolutely NO fuel at the instant u crack the throttle again. Maybe include in your build a microswitch on the clutch lever to tell the ECU to start in...
by Circlotron
Sat Aug 24, 2019 9:08 pm
Forum: Engine Tech
Topic: What's the ideal injector trajectory angle?
Replies: 39
Views: 1463

Re: What's the ideal injector trajectory angle?

Walter R. Malik wrote:
Sat Aug 24, 2019 3:30 pm
Toward the middle of the backside of a hot intake valve is accepted in most O.E.M. instances however, making the most power is not their first concern.
For a two valve head, yes.
What about for a four valve head?
You can't aim at both inlet valves at once.
by Circlotron
Wed Aug 21, 2019 8:24 am
Forum: Engine Tech
Topic: Spark plugs- ground strap”tech”?
Replies: 35
Views: 1993

Re: Spark plugs- ground strap”tech”?

I’ve been following a lot of people playing with some VERY high energy plasma systems the past few weeks and it’s interesting seeing them struggle with the exact opposite problems of traditional ignition systems. (Wearing our plugs SUPER fast even with Tungsten center electrodes and such high volta...
by Circlotron
Mon Aug 19, 2019 4:07 am
Forum: Engine Tech
Topic: Spark plugs- ground strap”tech”?
Replies: 35
Views: 1993

Re: Spark plugs- ground strap”tech”?

Maybe the sharp edges of the holes make it easier for a spark to jump to, compared to a smooth surface.
by Circlotron
Sun Aug 18, 2019 5:56 am
Forum: Engine Tech
Topic: 2020 Supra B58 Engine Teardown - First Look - Better than the 2JZ?
Replies: 39
Views: 1636

Re: 2020 Supra B58 Engine Teardown - First Look - Better than the 2JZ?

JodyB wrote:
Sat Aug 17, 2019 11:43 pm
viewtopic.php?t=43543
So I'm getting older.
I forget stuff.