Predator Lighting Coil

[bob58o]

I had to postpone it. I found out my mom was in the hospital and wasn’t able to get any information about what happened. Neither of us would have been able to enjoy ourselves.

We worked together for like 6 months, but she just quit. She gave me her number so we could stay in touch so I messaged her. She’s really cool. She’s a vegetarian but cool. I didn’t know she dated guys until kinda recently. Maybe that’s why she likes me, cause I wasn’t trying to hit on her. I was really just trying to keep the pen out of the company ink. Last few girls I dated at work, didn’t end very well. The last few girl I dated outside of work didn’t end very well either. Lol

We’ll see how it goes. I won’t get next week’s schedule until this Sunday, so hopefully we have a day off together.

 

[bob58o]

Kohler Flywheel
Kohler Fan
Kohler Stator

The black Fan looks cooler. get it?
They shipped the $18 timing light even after I requested to cancel it.
The degree wheel is here. My lapping compound must be down the street.

I think I want to buy the Electric Start blower housing.
Ugggghh... A hole cut in the Predator Housing leaves me finding s home for the key box. I think the keybox bolts to the protrusion for the starter motor.

I’m not even 100% sure it fits. It seems it should fit. The Hemi block is the same as a clone/Honda I believe. Hope the Predator starter cup holes align with the Predator recoil with the Honda Shroud.
https://m.ebay.com/itm/Red-Recoil-S...-Pull-Starter-Cooling-Fan-Cover-/141830994176

 

[Denny]

And I thought Kohler only made toilets!



Denny

 

[Nosandwich]

And I thought Kohler only made toilets!



Denny

Now the Chinese are "flooding " the market with crap....Oh the irony!

Just kidding.

Well...I CAN'T HELP MYSELF!!!

PEOPLE HAVE BEEN CRAPPING ON Koehler for years!!! Poor guys!

 

[bob58o]

I was thinking that the Kohler flywheel would be better quality than a clone or Predator Flywheel.
But I don't know... Pretty sure these small Kohler engines are built in China too.

I can't tell the difference between quality cast flywheel and a crap flywheel.

As far as I know, NR sells (or used to sell) racing engines that turn over 8k using a HONDA flywheel with ring gear. I doubt they used flywheels with charging magnets at that speed.

Wondering how a HONDA flywheel compares to a KOHLER flywheel?
Typical Japanese vs Chinese quality?

 

[bob58o]

While waiting on the timing light, I ordered the blower housing / fan shroud.
https://www.ebay.com/itm/141830994176
I hope it fits.

After I get the light, I can set the timing, then I guess I can add gas and begin the break in process.
I'll run some electrical tests at different rpms to see what the output is.

I'd like to be able to turn this engine 5,500 RPM.
Don't know what happens to a Kohler 3 amp charging flywheel at 5,500rpm. Do magnets fall off. Does the flywheel explode?
Don't know what (unregulated) voltage the charging system will put out at 5500 RPM? 20V?

After I figure that stuff out, then I can worry about the rest of the wiring or adding some type of voltage regulator if needed to charge the battery.
Need to pick a battery. Need to find something to put this on.

 

[bob58o]

I figured If I was going to be turing the engine over with a drill, I should put some oil in it.

I got 16oz of 10W-30 at the dollar store.
That is right. At the dollar store.

I would love a test to see how this oil compares with something like O'Reilly's Brand.

It will be emptied out before i start the engine. Stuff is probably corrosive. Might be better to run it dry. LOL

This might be the first predator I ever start without doing performance modifications first.
This Predator might keep the stock carb and governor even.
I vowed to never use a stock carb again, but I want the governor (at least at first) until I see how the charging system responds to higher RPMS. I THINK the flywheel will be ok at 5500 RPM.




Guessing if close to 6k RPM then volts might be close to 30?
Then I think something like this might work.... 60 Watt, 5 amps.
This is also on the last page, but this is what I am leaning towards trying if I find I need one.
https://www.amazon.com/DROK-Waterproof-Converter-Regulator-Transformer/dp/B01H52OIN0
DROK Waterproof Synchronous DC-DC Converter Buck 5.5-32V to 1-27V Voltage Regulator 24V to 12V to 5V 5A Adjustable VDC Solid Durable Power Supply Board

Module Properties: non-isolated voltage step-down module (buck)
Input voltage : DC 5.5-32V
Output Voltage : DC 1-27V adjustable
Lowest dropout: 2V, the input voltage must be higher than the output voltage 2V
Operating temperature: -40 to +85 °c
Operating frequency: 300KHz
Conversion efficiency: up to 92%
Protection: over-current protection; over temperature protection
Adopts synchronous rectification technology, high conversion efficiency and low heat
Embedding technology and aluminum shell, waterproof, dust-proof, moisture-proof
Wiring: Red: Input+;Black: Common-;Yellow:Output+
Conversion:12V to 5V, 24V to 3.7V/4.2V/5V/6V/9V/12V,etc.

Output Current: 5A Maximum
5V output: recommended 4A continuous
6-9V output: recommended 3A continuous
10-15V output: recommended 2.5A continuous

Please note:
1.This unit with no reverse polarity protection, please properly connected.
2.If use for battery,please install a separate output diode to stop the battery from feeding back and damaging the unit.

Package include:
1x DC Voltage Converter

 

[bob58o]

I hope 400 milliamps is enough to run the 12V DC Timing Light. Going to try a battery float charger. Picked up some other stuff while I was there.

I picked up Trickle Charger $5.99 w/coupon
https://www.harborfreight.com/automatic-battery-float-charger-42292.html

And another 3 Pc Hex Drill Socket Driver Set $2.99 w/coupon
https://www.harborfreight.com/hex-drill-socket-driver-set-3-pc-68513.html

60 Pc SAE and Metric Tap and Die Set $29.59 w/20% off coupon
https://www.harborfreight.com/60-piece-sae-metric-tap-and-die-set-35407.html

Multi-Meter Free w/coupon
https://www.harborfreight.com/7-function-digital-multimeter-90899.html

My plan was to buy a $6 float charger, but they got me for $42. Still not too bad.

 

[bob58o]

I ordered that voltage regulator. Waterproof, adjustable, and has heat sink looking case.

I also ordered some 1000V 10 amp rectifier diodes.
https://www.ebay.com/itm/10A10-10-A...e-10-Pcs-USA-SELLER-solar-panel-/131938333935

Description of regulator says "If use for battery,please install a separate output diode to stop the battery from feeding back and damaging the unit."

Says it has 2V drop out, so If I want 14.4V output, I need at least 16.4 Volts input.
I don't think that will be a problem.

Max input is 32Volts.
I don't think that will be a problem (even at 5,500 RPM), but it might be.

Max continuous recommended output at 15V is 2.5 Amps. This might be a problem as the charging system was designed for 3amps at 4000 RPM. I guess I will mount it where it gets plenty of wind.

I believe the DC regulator has a common input and output negative (connected inside the regulator?). So I should be able to use the single wire coming from the coil as the positive input and think I should be able to use the block (ground) as the negative input.

I should have paid more attention to electronics and E&M in school.

 

[bob58o]

The service manual I found for Kohler CH260, CH270, CH395, CH440
https://www.kohler-engine-parts.ope..._page=document_general_info&products_id=34596

Has the Flywheel Air Gap at 0.010".
I think honda clones are like 0.030" right?

Kohler Magnet with Predator Ignition Coil. It is at 0.025" Right now while I ponder where I want it.

 

[bob58o]

At 0.025” Flywheel/coil gap.... it fired here.
Now I’ll find out where HERE is compared to TDC.

 

[bob58o]

Timing was 19.5 - 20 BTDC, which exactly agrees with what I read it was on the thread about the Hemi with Kohler flywheel.

Now I need to decide where I want to set it.

I’m thinking 28 degrees BTDC might be good for a 5500 RPM engine?
27 BTDC at 4K RPM
26 BTDC at 5k RPM
25 BTDC at 5.5K RPM
24 BTDC at 6k RPM

I think stocker race engines usually run 34-36 BTDC.
I’m going try 28 BTDC.

 

[ezcome-ezgo]

28! 28! 28!

 

[zogthegreat]

 

[bob58o]

Uggghhh.. I just crack the degree wheel. I can brace it and tape it up. Trying to get leverage to remove the flywheel and I cracked it in half.

Anyway I ordered 3 keys.

A number 2 key is filed down by 0.020".
A number 4 key is filed 0.040".
A number 6 key is filed 0.060".
etc...

They claim 1.3 degrees per 0.010" filed off.
So a number 4 key (with the Kohler flywheel) would be 4 x 1.3 = 5.2 degrees advance or 25 BTDC initial timing.
A number 6 key would be 6 x 1.3 = 7.8 degrees advance or 27.5 BTDC initial timing
A number 8 key would be 8 x 1.3 = 10.4 degrees advance or 30 BTDC initial timing.

I order a 4,6,and 8 offset key.
Not sure I'll use a key at all.
If I do, I'll start with the number 6 key.
It should be like a stock predator with a 2 degree ignition advance.

But three keys shipped for $9 is the best price I've found.
https://www.ebay.com/itm/Honda-Clon...112729849696?_trksid=p2385738.m4383.l4275.c10

 

[ezcome-ezgo]

28 or bust.

 

[bob58o]

28 or bust.

I decided to try to file the stock key.
I took about 0.050” off.
It was about 0.160” thick and now 0.110” thick.
Should put me near 26-26.5 BTDC.

Good enough for me.
Just got to clean it up a bit.

 

[bob58o]

Like a glove.

 

[ezcome-ezgo]

I am not satisfied.

 

[bob58o]

I am not satisfied.

https://www.youtube.com/watch?v=2LRw679gUIw

---------- Post added at 02:18 PM ---------- Previous post was at 02:15 PM ----------

Fine. I'll take off another 0.0134615"