Thread: #6

**F5 Dave** · 4th April 2012, 17:16

Heck I dunno, all this kart stuff is greek to me, but that 2nd picture looks more to proportion. Anyway, what have you got against Dykes & their rings?

**husaberg** · 4th April 2012, 18:12

Originally Posted by F5 Dave

Heck I dunno, all this kart stuff is greek to me, but that 2nd picture looks more to proportion. Anyway, what have you got against Dykes & their rings?

I have nothing against the dykes more power to them. ESP topless on bikes.

But the thing is wob hates them and he's know more about them than me. According to him they supposedly rob a lot of power with friction which is a pain. Mainly cause all the pistons i found to suit Vanessa were lezbo equipped.

**speedpro** · 4th April 2012, 21:26

I put a set of Moriwaki 2 ring pistons in my old Z1. The compression ring was a dykes type. The difference was amazing. The pistons practically fell into the cylinders and the whole motor could be turned with no effort at all. When it was running however it was all good.
Personally I don't think Dykes type rings "increase" friction. It made a lot more power as well but that could have been helped by the huge valves or maybe the Moriwaki F1 cams or the new Keihin smoothbores.

**husaberg** · 4th April 2012, 21:42

Originally Posted by speedpro

I put a set of Moriwaki 2 ring pistons in my old Z1. The compression ring was a dykes type. The difference was amazing. The pistons practically fell into the cylinders and the whole motor could be turned with no effort at all. When it was running however it was all good.
Personally I don't think Dykes type rings "increase" friction. It made a lot more power as well but that could have been helped by the huge valves or maybe the Moriwaki F1 cams or the new Keihin smoothbores.

Yeah like i said no practical experience with them but i tried to include some in my build as they were easily available in sizes to suit but Wob wouldn't have a bar of them and as the best MX and GP bikes built since the 80's seem to have avoided them as well there must be a reason i guess.

This is part of what Wob said in an email.

The IAME kart pistons use L dykes rings to stop flutter ar 20,000 but have huge bore tension and wear out bores in no time, not an issue in the karts where they get rebuilt every 5 minutes.

As they Dykes style rings rely almost solely of gas pressure to seal i surmise they would only increase the friction load (against a conventional style) whilst under operation.
As Vanessa will be a 14000-15000 RPM engine the Dykes was a no gainer for my build.
TZ just posted this in the autopsy thread i guess instead of here.

Originally Posted by TZ350

A good read on piston rings:- http://americanmusclecarsaustralia.c...d.php?tid=2627

But it seems to back up the bore wear theory anyway.

Some guys in the blown fuel classes use stainless steel Dykes rings. The L-shaped Dykes or headland ring typically has a 1/16-inch face with an 0.017- or 0.031-inch step in the back of it, offering gas pressurization without the need for gas ports. Dykes rings need a special piston, are hard to seat, and accelerate cylinder-bore wear, so they're preferred for only very specialized applications.

**husaberg** · 17th April 2012, 23:04

Anyone know the weight of a mb100 engine?

**speedpro** · 18th April 2012, 06:20

yes .

**husaberg** · 18th April 2012, 06:58

Originally Posted by speedpro

yes .

Thanks,So how are you going with the book?

**F5 Dave** · 18th April 2012, 09:33

I'm still real confused by the stator you used. All I see are stators that get bolted on like this to the engine case, there is no backing plate like you have.

http://www.ebay.com/itm/CRF250X-2004...sories&vxp=mtr

250X & 250R appear much the same.

even the flywheels are reversed & look similar but different.
http://www.ebay.com/itm/2006-Honda-C...sories&vxp=mtr

edit. . . .ahh, it must be for a CR, 2 stroke MX, not CRF!

**F5 Dave** · 18th April 2012, 16:20

Oops, just bought a CR250 '02 stator & f/w. 8 pole & same as 125. From what I can see, 03 is a 4 pole for the 125 & there is a dif for the 00, 01s to the 02 onwards, but not sure what it is.

One could buy a 50W upgrade kit & you can get pirate ones quite cheaply but have to buy a flywheel so best to find one seller.

But this will drive my pump ok & then cope with an Ignitech & soil carb. . .one day.

**speedpro** · 18th April 2012, 18:57

New shiny bits, which when you zoom in look really rough. More coming this weekend, plus I've ordered a new stroker crank and a 65mm big bore kit with forged piston for my scooter. Better figure out a way of paying for it all now.

**koba** · 18th April 2012, 22:13

Originally Posted by speedpro

New shiny bits, which when you zoom in look really rough. More coming this weekend, plus I've ordered a new stroker crank and a 65mm big bore kit with forged piston for my scooter. Better figure out a way of paying for it all now.

In the photo I see 'KIWI' so it must be made in NZ

And I see 'Quality' so it must be of exceptionally good quality

**husaberg** · 18th April 2012, 22:22

Originally Posted by koba

In the photo I see 'KIWI' so it must be made in NZ

And I see 'Quality' so it must be of exceptionally good quality

I see in the background what looks to be the miss'es Kitchen bench top.

So he is living dangerously, or she' out and hes cooking up some special.

Great place incidentally to assemble engines it should be tidy, and freezer(bearing cooler) , Jug and parts washer (Dishwasher) and oven (Case preheat-er) Rags (tea towels) but make sure you put the plug in the sink

**speedpro** · 27th April 2012, 19:32

With help from TZ350 I now have the crank back together. Him and I have been whacking it with hammers and prying it with a big crowbar and it still isn't as good as when we first pressed it together

I've got a few more to do so it's good practice.
Unfortunately I have more pressing matters to deal with this weekend - putting my scooter back together. All the parts have arrived so it'll now be a bit over 200cc.

**Yow Ling** · 27th April 2012, 19:46

Originally Posted by speedpro

With help from TZ350 I now have the crank back together. Him and I have been whacking it with hammers and prying it with a big crowbar and it still isn't as good as when we first pressed it together

I've got a few more to do so it's good practice.
Unfortunately I have more pressing matters to deal with this weekend - putting my scooter back together. All the parts have arrived so it'll now be a bit over 200cc.

Get a bigger hammer, I dont find practice makes perfect, they all different, you adjust one one way and they move in a diferent plane, others just take one hit, some are just plain rooted, helps if when you press it up it not too on the piss, I did one for a friend and peeled the inside of his crankweb, that wasnt my proudest moment. This weekend Im going to have a stab at boring the crankwebs to go from a 19mm pin to 22mm Ill practice on a scrap crank this is at the uncomfortable end of things for me.

200cc scooter will be cool, they eligible for buckets eh , you know they just a scooter

**crazy man** · 27th April 2012, 20:13

Originally Posted by speedpro

With help from TZ350 I now have the crank back together. Him and I have been whacking it with hammers and prying it with a big crowbar and it still isn't as good as when we first pressed it together

I've got a few more to do so it's good practice.
Unfortunately I have more pressing matters to deal with this weekend - putting my scooter back together. All the parts have arrived so it'll now be a bit over 200cc.

dad made a jig up for pressing cranks together he did not have to do anything to it after it was so good