Aftermarket Cylinder Quality

[isaaccarlson]

I tried a hyway cylinder on my 661 and where the plating started pealing was no where near where I messed with the exhaust and the lip of the port felt fine. Still bummed out because I ran that cylinder throughout the day and it was running really well. I only noticed the damage as when I got home I pulled the jug. After that I went back to the used oem cylinder that I was using to replace the original that was on the saw and decided to go a head and port that one.

Which So far seemed to be a good decision at least with the cookies I cut today. But I know there's more in it. I need to get a squish band mandrel....

That squish band looks pretty good already. Your plug is pointed the right way, but it could be side gapped. Use a dremel wheel to cut the grounding electrode back to the far side of the center electrode. I do that with mine and they pick up a bit. It lets the spark travel straight out instead of making it go around the ground electrode.

 

[Absolution]

That squish band looks pretty good already. Your plug is pointed the right way, but it could be side gapped. Use a dremel wheel to cut the grounding electrode back to the far side of the center electrode. I do that with mine and they pick up a bit. It lets the spark travel straight out instead of making it go around the ground electrode.

I'll take your advice on my oem cylinder but that photo is of the hyway and yes the port numbers were really good and the squish band looked good but he plating started pealing off which is visible in that photo when you enlarge it.

 

[isaaccarlson]

Here is a picture

 

[isaaccarlson]

I'll take your advice on my oem cylinder but that photo is of the hyway. The plating started pealing off which is visible in that photo when you enlarge it.

Ohyeah, duh! I saw that. My wife did too. I forgot that you replaced it.

 

[Absolution]

Ohyeah, duh! I saw that. My wife did too. I forgot that you replaced it.

Yeah, Honestly I think the thing that made me really upset was I cut the cylinder base by hand. So a lot of time sanding and checking progression to make sure I was keeping it square, to removed .045 of material. I ended up doing the same to the oem cylinder but thankfully it just a bit less I had to remove and it gave me more blowdown off the bat which I wanted. Though I would like a more oval exhaust port than I got.

By the time I "Finished" the OEM jug went as follows.

Exhaust 100
Transfers 120-125
Intake 90
Squish .025

EDIT: I want to get the band cut, then cut more off the base and then epoxy the cylinder back up keeping it square and narrowing it to a smaller wide channel. Which I believe is counter productive to the current way of thinking of tight circle but I just want to try it.
EDIT: picture is of the OEM jug I was using before I tried the hyway but now again but ported.

 

[isaaccarlson]

The intake is at 90⁰???? Wow.

 

[Absolution]

The intake is at 90⁰???? Wow.

That's what it came out as. The factory lip is still slightly there and I'm running a weisco piston but I don't think there's any skirt length difference.

 

[slackinoff]

Here’s a brand I haven’t heard anyone talk about. It’s Taiwan made. “Laser” - this one is product #44337 and is $77 dollars plus shipping on Cutters Choice (who might be the dealer for Laser cylinders??? Not sure). But I found it cheaper on eBay, see below.

But so far it seems like a step above and it’s actually only $35 shipped with what appears to be a highway piston! (Piston is marked “HW” on the crown exactly like my other highway pistons and is identical to another highway 372 piston)

So I took a gamble on eBay because the product number wasn’t in the eBay advert, but Cutters Choice has an eBay store and it’s only $35 free shipping on there!

I haven’t timed it yet but the squish with no base gasket is .023.

It’s hard to picture the upper transfer angles, but they are there and looking pretty decent to me.

Check out the first photo comparing farmertec 372 kitsaw provided cylinder to this Laser #44337. Specifically the exterior transfer tunnel divider angle. The Laser is more correct, at least when comparing to OEM Mahle.



Oem Mahle

 

[slackinoff]

Here’s the intake, piston, box, little info page included, and the eBay advert.

 

[isaaccarlson]

Looks like it will work!

 

[legdelimber]

Nice looking casting.

What does anyone figure about the little globular beads where the ports transition into the chamfers?
I see this in a number of images/cylinders and wonder about it.
I'll assume that size and shape plus location are what dictates the impact.

Would you figure a little turbulent roll that tracks back along the cylinder wall and helps sweep?
or just a disturbance of directional flow that interferes with scavenging?
Keeping in mind that all of the port tunnels and such are a part of this question of course.

Ive only altered the ports in a few cylinders, so not enough, personal, hands on experience to compare piston wash and carbon buildup.

I'm the guy who always looks at rocks in creeks and ditches to see how lumps affect water flow.
Cracks in sidewalks, tufts of grass, you name it and I've probably stood and looked at rain water flowing or the deposits of debris from it.
Dirt buildup in a vacuum cleaner nozzle or air filter housing, gutter spouts, wind blown leaves under a car etc, you name it it and my A.D.D. & O.C.D. ass has probably sat and pondered the flow patterns left behind.

 

[isaaccarlson]

Nice looking casting.

What does anyone figure about the little globular beads where the ports transition into the chamfers?
I see this in a number of images/cylinders and wonder about it.
I'll assume that size and shape plus location are what dictates the impact.

Would you figure a little turbulent roll that tracks back along the cylinder wall and helps sweep?
or just a disturbance of directional flow that interferes with scavenging?
Keeping in mind that all of the port tunnels and such are a part of this question of course.

Ive only altered the ports in a few cylinders, so not enough, personal, hands on experience to compare piston wash and carbon buildup.

I'm the guy who always looks at rocks in creeks and ditches to see how lumps affect water flow.
Cracks in sidewalks, tufts of grass, you name it and I've probably stood and looked at rain water flowing or the deposits of debris from it.
Dirt buildup in a vacuum cleaner nozzle or air filter housing, gutter spouts, wind blown leaves under a car etc, you name it it and my A.D.D. & O.C.D. ass has probably sat and pondered the flow patterns left behind.

I don't see anything that can't be cleaned up real quick.

 

[slackinoff]

Laser Pro #44337 Tiawan cylinder timing with no base gasket.

Exhaust 103
Transfers 128/128
Intake 73
Squish .023

 

[slackinoff]

I wanted to run a little more intake timing. Don’t want to grind the cylinder for various reasons.

Can I grind the piston in the shape of the port so it opens all at once?

See my pic of 78 degrees marked on piston.

 

[isaaccarlson]

I wanted to run a little more intake timing. Don’t want to grind the cylinder for various reasons.

Can I grind the piston in the shape of the port so it opens all at once?

See my pic of 78 degrees marked on piston.

View attachment 398676

Just make sure you leave skirt on the side of the port. You need something riding on the sides to support the piston and to seal.

 

[isaaccarlson]

I like the numbers on that cylinder. Seems like they should work for a lot of guys with grinders.

 

[isaaccarlson]

I cant find the user on ebay or the listing. The closest item is a cylinder with the same part number for $107.

 

[Agent Smith]

I cant find the user on ebay or the listing. The closest item is a cylinder with the same part number for $107.

Type in ebay item # 122731076561

 

[slackinoff]

@isaaccarlson @Agent Smith

Thanks guys - Hey Isaac, yep that particular advert is now gone...I thought it had a quantity of 10 or so but I must have been mistaken. The listing # Agent Smith suggested brings up a listing from the same seller I used, and it states it's a Laser branded cylinder....but I am just not sure if it's the same Laser #44337 cylinder I purchased. I have sent a msg to the seller to see if that advert is for Laser #44337. I will get back with yall once they reply.

Here is a link to the listing Agent Smith was talking about though, hopefully the seller will confirm with me that it's a Laser #44337 cylinder. For $40 bucks shipped, it's still a deal in my opinion. Especially that it comes with a Highway piston.
Ebay Listing # 122731076561

 

[slackinoff]

Just make sure you leave skirt on the side of the port. You need something riding on the sides to support the piston and to seal.

Ok thank you. I have been searching to find examples of guys trimming a little skirt for more intake timing. I just don't want to grind the intake yet. I might try a 50mm pop up windowed piston from a 268 in the future with this cylinder, and they are shorter skirt. So if I ground on it now, it might be too much intake with the 268 piston.