Dyno tested....Mastermind's ported 261cm vs Stock 261cm Gotta see this one.

[KG441c]

I always like the conservative approach? U can go back in but band-aids dont stick to H1R at 32 to1!!! Lmbo

 

[Duane(Pa)]

I work some strange hours. Pays for the PSA. Yes, I do lay awake at night and graph things (in my head). Or do I lie awake?

 

[Mastermind]

Me too. There are times when I can't sleep at all. Too much on my mind......

 

[Duane(Pa)]

MM, don't you have one of these (261CM) to sell?

 

[Mastermind]

I sold it this morning Duane.

 

[Duane(Pa)]

I sure like mine even though it's not a CM!

 

[Mastermind]

Dexter ended up grabbing the one I had for sale.

 

[User Name Here]

I'm in for the testing of the 461! I've only got 5 months to wait! Is it really that far away? Geez....

 

[KG441c]

Me too! Randy is a busy man!! He will get to it and it will be worth the wait

 

[DexterDay]

Dexter ended up grabbing the one I had for sale.

Thank you again Randy..

Pure luck......

is that what people are calling it now

 

[rburg]

I am glad Dexter bought your saw and took the pressure off of me. It sure was tempting.

 

[fastLeo151]

Here's mine. Its a beast but I'm really a 70cc and up kinda guy

 

[chadihman]

I'm in awe of how the HP hangs on in the high rpms. Thats 2.362 HP more than the stock 261 at 13k. Has a pretty stable max HP between 10,000-11,500 rpm.

 

[Mastermind]

That really is pretty impressive. Not a huge gain at 9000.......but as RPM increases the spread gets insane.

I wish I had the knowledge to explain what we are seeing, but I don't. I made a hairy guess......and it paid off.

The way I stumbled onto what I'm doing to this saw is from studying a lot of different saws, and their factory timing numbers.

Thinking about the fresh air that is brought into the transfer passages, and what happens to that air when the transfers first begin to open, then looking at a 562s timing numbers, made me think..........I wonder what would happen if I raised the ever loving hell out the transfers in this saw?????

That's the best I can do for an explanation.

 

[KG441c]

I hope a 461 headed ur way Chad has a hang up about it!!!! Lol

 

[chadihman]

That really is pretty impressive. Not a huge gain at 9000.......but as RPM increases the spread gets insane.

I wish I had the knowledge to explain what we are seeing, but I don't. I made a hairy guess......and it paid off.

The way I stumbled onto what I'm doing to this saw is from studying a lot of different saws, and their factory timing numbers.

Thinking about the fresh air that is brought into the transfer passages, and what happens to that air when the transfers first begin to open, then looking at a 562s timing numbers, made me think..........I wonder what would happen if I raised the ever loving hell out the transfers in this saw?????

That's the best I can do for an explanation.

How about I send you a couple 261 cylinders with my 261 for my 8/28 appointment? You do three different port jobs of your choice then I'll test each one.

 

[chadihman]

I hope a 461 headed ur way Chad has a hang up about it!!!! Lol

Its sitting in a box in my garage right now along side with a special 460 in a box. I've been doing some 660 tests lately. I'll fit the 461 in tonight or tomorrow night and get it shipped out asap. the 460 will hopefully get tested on tuesday.

 

[Mastermind]

How about I send you a couple 261 cylinders with my 261 for my 8/28 appointment? You do three different port jobs of your choice then I'll test each one.

I'd do all three exactly the same Chad. I've done over 50 of these 261s......and have tested every combination of numbers you can imagine. This is as good as it gets.

 

[Dieselshawn]

I'd do all three exactly the same Chad. I've done over 50 of these 261s......and have tested every combination of numbers you can imagine. This is as good as it gets.

This will show consistency between cylinders that you ported.

 

[Mastermind]

Trooph