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Search: Posts Made By: SrTelemaster150
Showing results 1 to 25 of 78
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Forum: Gas Engines
04-06-2019, 07:09 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Gonna' take a pretty big starter to turn over a...

Gonna' take a pretty big starter to turn over a 12.8:1 compression ratio FA-512R3 unless the throttle is completely closed, if the starter won't do it with the throttle cracked, it would turn into a...
Forum: Gas Engines
04-06-2019, 03:49 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

OK, I misunderstood. I thought you were using...

OK, I misunderstood. I thought you were using negative CC pressure as an induction boost like YS does on their so called "supercharged" singles.

Running the induction through the CC will help...
Forum: Gas Engines
04-05-2019, 07:59 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

How does one get negative crankcase pressure with...

How does one get negative crankcase pressure with a radial?
Forum: Gas Engines
04-04-2019, 05:35 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

This project has been on a back burner for a few...

This project has been on a back burner for a few years but I’m going to move it to the front.




Since there is no wrist pin offset built into the pistons, there is no appreciable dwell in #1...
Forum: Gas Engines
03-31-2019, 06:18 PM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Yes, indeed I did. Problem is, some of the less...

Yes, indeed I did. Problem is, some of the less experienced people here looking for knowledge might not know that. I just wanted you to clarify that point.




I can be a bit frank at times and...
Forum: Gas Engines
03-31-2019, 02:57 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

I am not questioning if it works, obviously it...

I am not questioning if it works, obviously it does.

I am questioning the ambiguous timing value nomenclature.



"but he did not realize that the piston is on TDC when the centerlines of the...
Forum: Gas Engines
03-31-2019, 02:54 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Information I have from a very reliable and well...

Information I have from a very reliable and well informed source on the subject is that only 120* spaced magnet rings are available for the big block radials

That is why I asked Morris Mini Motors...
Forum: Gas Engines
03-31-2019, 02:26 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

What does "crank design" have to do with this? ...

What does "crank design" have to do with this?





https://www.yellowbullet.com/forum/showthread.php?t=490494

A snippet from the above linked article.
Forum: Gas Engines
03-30-2019, 02:20 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Being a "technician" is a little different than...

Being a "technician" is a little different than understanding and performing geometrical modifications to existing engines.

I have been doing that for nearly 40 years now.

I do not profess to...
Forum: Gas Engines
03-30-2019, 02:06 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Does Morris Mini Motors have magnet rings with...

Does Morris Mini Motors have magnet rings with the same uneven spacing for the FG-84? I only need the ring since I am doing this an an FA-512R3 prototype conversion.
Forum: Gas Engines
03-30-2019, 01:33 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Editing for corrections.

Editing for corrections.
Forum: Gas Engines
03-29-2019, 04:24 PM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

You are avoiding the question. How does...

You are avoiding the question. How does 126-108-126 magnet spacing result in 120-120-120 spark timing?

Is the FG-60R3 NOT built on 120* cylinder spacing?
Forum: Gas Engines
03-29-2019, 04:01 PM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

I am well aware of how the 4 magnets work. Before...

I am well aware of how the 4 magnets work. Before the 1st prototype of the 3-cylinder system was even developed, I discussed the concept at length with Adrian. Although I did not grasp the concept at...
Forum: Gas Engines
03-29-2019, 12:44 PM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Delete inadvertent post.

Delete inadvertent post.
Forum: Gas Engines
03-29-2019, 10:01 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

How does that result in 120* firing order?

How does that result in 120* firing order?
Forum: Gas Engines
03-29-2019, 09:06 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Yes you are correct. One must be cautioned...

Yes you are correct.

One must be cautioned however to not take those values too literally. Rod length/crankshaft stroke ratios will skew those values a bit.

Interesting though is the...
Forum: Gas Engines
03-29-2019, 04:29 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

Set #1 cylinder ignition advance at whatever...

Set #1 cylinder ignition advance at whatever value would be best. I use 35* BTDC for methanol, (glow fuel) but that's not relevant for what we are discussing here.

Use a piston stop to set that...
Forum: Gas Engines
03-29-2019, 04:02 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

I am still unsuccessfully searching for an...

I am still unsuccessfully searching for an article that cites the differing ignition advance between cylinders of the P&W R-2800 engine.

In the mean time, here is an article that illustrates the...
Forum: Gas Engines
03-29-2019, 03:29 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

MATHEMATICS IS AN EXACT SCIENCE. It does not vary...

MATHEMATICS IS AN EXACT SCIENCE. It does not vary regardless of where the slave rods are linked to the master rod. We are talking about geometry here and that is mathematics.

30 crankshaft degrees...
Forum: Gas Engines
03-28-2019, 11:24 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

I am not disagreeing with you on that point. In...

I am not disagreeing with you on that point. In fact it is the twisting, bending if you will, of the rods that causes the variance in linear piston position relative to the head deck.
...
Forum: Gas Engines
03-28-2019, 08:54 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

At TDC the bores of the slave rods are in line...

At TDC the bores of the slave rods are in line with the main crank journal hence there is no difference in piston position in relationship with the length of the bore. At 30 crankshaft degrees, or...
Forum: Gas Engines
03-28-2019, 06:10 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

OK, there is a leading and trailing rod angle...

OK, there is a leading and trailing rod angle geometric factor in play and it is about 7* respectively between the linked & master rod C/Ls. A total of 15* variance between #2 & #3 rod angle.

This...
Forum: Gas Engines
03-28-2019, 05:32 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

If you can find a way to measure the piston...

If you can find a way to measure the piston distance from TDC at your 30 degree BTDC ignition timing, I think you might be surprised. At 30 crankshaft degrees the position of the piston in the bores...
Forum: Gas Engines
03-28-2019, 04:03 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

How are you measuring the degrees BTDC? Of you...

How are you measuring the degrees BTDC? Of you are using a piston stop, that explains the variance. You're not measuring crankshaft degrees but rather the distance of the piston from TDC

I...
Forum: Gas Engines
03-27-2019, 04:37 AM
Replies: 2,806
Views: 711,504
Posted By SrTelemaster150

I am fully aware of how radial engine rods are...

I am fully aware of how radial engine rods are designed.

Unless the bores for the slave rod link pins are mislocated in the master rod, there will be no variance in the relationship of the TDC...
Showing results 1 to 25 of 78
 
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