Head stuff

[typ4]

For those that may ever have questions about the glow plug precup relationship here is a couple pics, the shiny one was machined with a tool I borrowed from a great guy. Oh and some sanded smooth porting.

 

[icanfixall]

Gees Russ... Now your just embarrasing me... Those are really some great clear pictures of the whats what in these heads. I really like the injector cross cut. It shows the true thickness in those special areas. You did a great job of cutting the head in the right places. No blade wander either... I would love to see a cut going from end to end of the heads. Probably have to do it to an already cut down section. The intake bend would be the best area to showcase... Thats the tuff area for porting because of the tight bend... I remember the heads you cut up and sent to Mel years ago... Those pics are great too....

 

[BioFarmer93]

Russ,
Excellent photos- really clears up a couple of mysteries for me. I recently acquired a set of 7.3 turbo heads and was thinking about porting them, but then started wondering if it was actually worthwhile to do so. I'm slowly gathering parts to turbo Henry, and was curious as to how an intercooler is sized. I have one from a Mitsu Fuso box truck but think it might be for the 4.9 rather than the 7.5... Is there a formula you use for cfm that determines size? Also, as for N/A heads vs. turbo heads, what is the difference?

 

[racer30]

Hey I got a question , how much can you cut off the "shelf" around the valve guide in this head? I port stock chev heads and I take alot off this area and tear drop the guide. that pic is great but I dont know if the guide is cooled in this head. and I dont want to find out the way.

 

[typ4]

Hey I got a question , how much can you cut off the "shelf" around the valve guide in this head? I port stock chev heads and I take alot off this area and tear drop the guide. that pic is great but I dont know if the guide is cooled in this head. and I dont want to find out the way.

Agnem has the slices of head , I may have more pics. I will look.

 

[racer30]

Thanks I only have one pair of heads at this time so I would be in the dog house if I wrecked one.

 

[typ4]

you wanna grind on a junker?? I have one here and I am working in steilacoom during the week.

 

[riotwarrior]

Awesome so how much more are you planning to do in the runners and in the bowl area of the valve? Some detail around the subtle tear dropping of the guide? Looks like there is some room on that inside radius of the runner going into the bowl area to maybe widen up the port straighten the path out, whats yer take?

 

[icanfixall]

Well, If I'm lucky enough to post up some of my port work you can see... Nope... Can't find them.... I will do some looking later... Sorry...

 

[racer30]

I think the biggist gains are in the valve throat just under the valve seat. start with a 5 angle valve job then blend into the port from there. then the valve guide shelf and the inside bend of the port, then the port matching to manifolds. the intake ports dont need to be super smooth we dont have wet flow to worry about. the port size is ok for a low to mid range rpm engine so no need to make it bigger just need improve it. Im also looking at the valve seat area on the combustion chamber. the valve opens .380 inch, if you put the valve in the head and hold it at .380 you can see the the flow is forced to change direction at the valve recess in the head. some of this can be reshaped but you need to aware of the head gasket surface and dont get crazy. the exhaust side needs the same treatment but keep port size small for fast high pressure gas flow to the turbo.

 

[88beast]

sweet id love to have a cut up cross section like that on my bench
ima save these for porting stuff later

 

[racer30]

Thanks Russ your still over 100 miles south of me, Im in skagit county about 70 miles north of seattle. I say seattle on my profile because most people don't know where sedro-woolley WA is. I have "smoothed out" several types of piston engines just never done a diesel. Just got my electirc long neck die grinder yesterday, my long burrs are on the way. I burned up a air compressor before so going electric this time. Brad

 

[Black dawg]

Thanks Russ your still over 100 miles south of me, Im in skagit county about 70 miles north of seattle. I say seattle on my profile because most people don't know where sedro-woolley WA is. I have "smoothed out" several types of piston engines just never done a diesel. Just got my electirc long neck die grinder yesterday, my long burrs are on the way. I burned up a air compressor before so going electric this time.

your avatar needs some sound.

 

[racer30]

sound? well I got some sound from a video - or maybe I could put a little video clip in my avatar. Brad