Max head flow for 25 psi race motor

[BruceH]

Looking forward to the test results.

 

[psfracer]

So am I.

 

[Department Of Boost]

Looking forward to the test results.

So am I.

Ditto, ditto.

 

[05stroker]

Heads cc'ed at 51.5 on all chambers. I was surprised I thought they would be closer to 53cc with all the meat I took out. They have had .005 off them before but still. Maybe there was some taken off at another time during one of my may rebuilds, I don't remember. After checking the cc's I filled a couple chambers with 50 cc's and measured the depth that needs to be milled of the head. That came to .020 to get down to 50 cc's where I want to be. Should have the heads in the machine shop tomorrow and out by the end of the week.

Got two of these for $3.39 at Tractor Supply Co. They have all the syringes you can ever ask for.



.020 needed off the heads.



CC on the heads.



Just incase anyone wants to see what 1cc or 1ml looks like.

 

[BruceH]

It just keeps looking better. Have you given any thought to just milling a minimum amount so there is room left? You have put a lot of work into these and it would be a shame if the lifespan was shortened when it didn't have to be. IMO of course, lol.

 

[05stroker]

It just keeps looking better. Have you given any thought to just milling a minimum amount so there is room left? You have put a lot of work into these and it would be a shame if the lifespan was shortened when it didn't have to be. IMO of course, lol.

If that day is ever here and they need milled more I guess we will be talking out 12.0:1 CR. LOL

Or a thicker head gasket.

Besides, I could do it again, it was only 20 hrs of my life!

 

[05stroker]

Hell, all it would take to get to 11.92 cr is a .032 gasket instead of the .043 I have on the way now. But I want to leave something to add more power later . Haha

Besides, I'm sure Manuel is already dreading the tune on this thing. LOL

 

[rcm90]

Looks good, in for flow numbers! Any chance you can test for port velocity as well??

 

[05stroker]

Looks good, in for flow numbers! Any chance you can test for port velocity as well??

Not sure, this is my first time to have some flowed. Really the only reason I am flowing them is to see if the stack up with the pros. I will be pushing air through them at a much faster rate then the flow bench could ever do. Flow is flow though... IDK

 

[05stroker]

I think I just found my new best friend!

http://durafix.com/index.html#order

Okay, so this stuff works well on thin aluminum but not so much on thicker items like I needed. It did work well for an problem after my son wrecked his new 250R though. Should do fine till we get the new one.

 

[skwerl]

I'm assuming you need to heat up the surrounding metal so it bonds, similar to welding but lower temps? Maybe hitting the intake manifold with a propane torch to warm it up may help.

 

[05stroker]

I'm assuming you need to heat up the surrounding metal so it bonds, similar to welding but lower temps? Maybe hitting the intake manifold with a propane torch to warm it up may help.

I was using a propane torch like in the video above, the other end of the head was to hot to touch since I had it there so long. I am going to have a buddy weld it up. I am ready to get the heads on the bench.

 

[05stroker]

Got the heads back today. I had them take .020 off the deck. I was at 51.5 cc before. Goal is 50cc.

I CCed them again tonight.



They showed to be dead on at 50.0 ccs. The syringes had 60 ccs to start. That sould give me 11.57 C/R



Then I decided to check a little closer. I filled them to 48cc with the large syringe and then used a small 3cc syringe to get it exact. They came to 50.5cc that is 11.48 C/R.

I am debating whether I want to take another .020 off them get them to 49.5 which would net me 11.66 C/R or leave them at 11.48 as is. That will depend on what I find tomorrow after I check the ex. valve clearance. If it will clear with .020 more off I will re deck the heads. If not, and that is what will make the valve reliefs need to be added then the heads will remain as is. If reliefs are needed anyhow as is then I my mill again as well.





here is a look at the decked heads as is.



And the delete plates now that the have been milled down after I welded the factory gasket grooves up. Now the need to be cleaned up on the sides and port matched to the heads.

 

[05stroker]

Head flow numbers

Someone asked if I had flow numbers yet and this was my response.



No, the local guy that I had planed on using took a automotive teaching job at a local collage. I am still going to try and find someone to do it before the final assembly of the motor.

 

[rcm90]

They look great!

 

[05stroker]

They look great!

Thanks! If un shrouding the valves helps, then these should make some REALLY nice gains. How ever they do, I will take it for my first port job.

 

[crownaviation]

What was your shipping address again? Lol

Looks great, expected nothing less from you...

Also, can't you just weld those plates to your intake?

 

[05stroker]

What was your shipping address again? Lol

Looks great, expected nothing less from you...

Also, can't you just weld those plates to your intake?

I guess you could, but the area I am working on is the head side.

 

[05stroker]

Okay, so I checked the PTV clearance with some modeling clay. We have clearance for days! I first checked with the timing set strait up. Then I checked it with the timing 4* retarded via the adjustable crank gear. Keep in mind my cams are locked in the full advanced position. Here are the numbers.

Strait up In 0.2665
Ex 0.3365

-4*retard In 0.2975
Ex 0.2755

Head gaskets show to be 0.043 compressed and measure 0.046 now so I will loose that.

I have about 1/4" clearance to put it in layman terms! Now to decide whether I want to take another .020 off them or not to put them at 49.5cc.

 

[05yellowgt]

That just tells me you need higher lift exhaust cams!!!

Sent from my Transformer Prime TF201 using Tapatalk