Cylinder head

[croat1]

Another alternative to the Cool Heads....

https://www.phatheadracing.com/

Joe

[Hawaiiysr]

thats cool. good to know

[croat1]

Not listed on their website.  Have to call them.

[broken1]

I don't understand why the aftermarket o-ringed heads are machined with equal size coolant passages all the way around. After all this time you'd think they'd have that figured out.

[Langbolt]

I don't understand why the aftermarket o-ringed heads are machined with equal size coolant passages all the way around. After all this time you'd think they'd have that figured out.

Exactly! The only one I have seen with the coolant passages machined correctly is the Pro-X cast head.

Even MOD-QUAD machines all the passages the same.

https://www.modquad.com/product/250r-cool-head/

[All250R]

I don't understand why the aftermarket o-ringed heads are machined with equal size coolant passages all the way around. After all this time you'd think they'd have that figured out.

I'm on my second prototype for a head that matches the head gasket's coolant ports. I had a local shop working with me, but they ran out of steam with me. It's also based on the old RK deisgn, so it will be easier a little easier to place the o-ring groove than a coolhead  style.
Bryan May has redone the design file, and hopefully will have a head cut for me this month.

It will be made from 6061T6 and will have a slotted head-stay.
I'll post an update when I get the new prototype.

[croat1]

I don't understand why the aftermarket o-ringed heads are machined with equal size coolant passages all the way around. After all this time you'd think they'd have that figured out.

I'm on my second prototype for a head that matches the head gasket's coolant ports. I had a local shop working with me, but they ran out of steam with me. It's also based on the old RK deisgn, so it will be easier a little easier to place the o-ring groove than a coolhead  style.
Bryan May has redone the design file, and hopefully will have a head cut for me this month.

It will be made from 6061T6 and will have a slotted head-stay.
I'll post an update when I get the new prototype.

Can’t wait to see it!!!

Joe

[All250R]

Thanks Joe. In that case, here are a couple preview images.
Jason

[Hawaiiysr]

Nice!

[croat1]

Modified OEM head

[Langbolt]

Modified OEM head

Joe, did they weld up the coolant passages and re-machine the new passages ? That is very interesting!

[All250R]

I don't understand why the aftermarket o-ringed heads are machined with equal size coolant passages all the way around. After all this time you'd think they'd have that figured out.

I'm on my second prototype for a head that matches the head gasket's coolant ports. I had a local shop working with me, but they ran out of steam with me. It's also based on the old RK deisgn, so it will be easier a little easier to place the o-ring groove than a coolhead  style.
Bryan May has redone the design file, and hopefully will have a head cut for me this month.

It will be made from 6061T6 and will have a slotted head-stay.
I'll post an update when I get the new prototype.

Can’t wait to see it!!!

Joe

I got the second prototype back from Bryan May (Outlaw Racing). He's posted some media pics, but thought I'd post here a few shop-quality photos.
It needs to be tested, and any tweaks made before production runs are made.

The main problems being solved are
  *coolant flow regulation for oring'd heads
  *easier to place the combustion oring than with the well known coolhead design

I'm not sure how best to sell these. I may go to Dave Moore, and Jerry Hall to see if they have a need for a batch order. I'll probably keep a few on  hand for individual customers too. Any thoughts are welcome.

[croat1]

Jason, very cool!  How were planning to hold the domes when cutting?

I’d reach out to LED, Pete at Hybrid and Bubba Ramsey including the 2 names you mentioned.

I’d be interested in a few.  Any idea on price point?

How

[All250R]

Jason, very cool!  How were planning to hold the domes when cutting?

I’d reach out to LED, Pete at Hybrid and Bubba Ramsey including the 2 names you mentioned.

I’d be interested in a few.  Any idea on price point?

How

Sorry for slow reply Joe.
*I haven't made one yet, but I think they can be cut with a piece threaded into the spark plug hole might be the easiest.

*Thanks for the tip on builders. I'll do this once I have the prototype tested. The slot needs to accomodate non-gasketed heads with no spacer place to CR gaskets with a spacer plate. An ATC/TRX gaskets may be possible (w/spacer plate), and a couple other tests need to pass. We're heading to summer here in Phx (which isn't fun), so I'm working on a plan to test, and get that feedback to Bryan.

*I don't have a firm price yet because I want to bright anodize (clear) the shell so it's finish stays consistent over time for people who maintain a quality ashetic (like me). But I'll try to keep cost with an uncut dome close to what a $240 coolhead would be. I think this would be good for people/builders who want their head spac'd for their own specific engine.

That's the idea so far anyway.