Type 4 heads - beyond repair?

AirPower · Post by **AirPower** » Mon Sep 17, 2007 12:33 pm

Not knowing a lot about this motor - please give me an opinion on the damage to these heads. Do you think they can be used, polished and valve sizes increased?

This looks as if some object got caught between piston and head - damaged the area around the sparkplug.

This exhaust valve is terribly burnt - and some of the valves are recessed very deep - does that mean the seats are shot?

Lastly, in the vaal triangle, who would you recommend that I take these heads to if I want larger valves installed?

Thanks for your time

Mario (very worried)

Post by **Pepsicola** » Mon Sep 17, 2007 12:42 pm

Ensco Engineering in Vanderbijlpark. Have done my Alfa's head there without any problems.

Blitzkrieg · Post by **Blitzkrieg** » Mon Sep 17, 2007 12:42 pm

The best man to speak to for this kind of thing would be IMPI

Post by **calooker** » Mon Sep 17, 2007 1:37 pm

No cracks those heads, good to use.

vader · Post by **vader** » Mon Sep 17, 2007 9:06 pm

Ditto to that calooker

Post by **IMPI** » Tue Sep 18, 2007 7:43 pm

But there are lots of other problems
1 those heads have been fly cut look at the cut marks on the flat part of the fins this means that your compression ratio may be to high
2 there is already a few oversize seats eg the intake. probably means they had a hard life and all seats are suspect
3 those black marks (carbon) on the fins next to the sparkplugs shows distortion (combustion leaks) next to the spark plugs.

all of these can be rectified but if the previous flycutting was too deep it will just do the same again.
Armand

vader · Post by **vader** » Tue Sep 18, 2007 8:54 pm

Impi the MAN!!!!

vader · Post by **vader** » Tue Sep 18, 2007 8:55 pm

I'm so glad your on this site!!!

Post by **Bugger** » Tue Sep 18, 2007 10:01 pm

It`s good when a plan comes together

vader · Post by **vader** » Tue Sep 18, 2007 10:43 pm

A-Team!!

AirPower · Post by **AirPower** » Tue Oct 30, 2007 10:40 pm

Thanks guys. I appreciate the advice - these heads do look in a very bad state to me. So far I've managed to source one replacement 1800 head (for R950) if I can get a hold of one more I'll keep these spare.

AirPower

vader · Post by **vader** » Tue Oct 30, 2007 10:56 pm

good luck

forcecooled · Post by **forcecooled** » Wed Oct 31, 2007 10:06 am

If there were no other heads left in the world, you could have those spot faced, new seats etc, installed, and shim up heads or /and pots to decrease the c/r --thats if its too high now. Check the cc;s on the heads - I am sure Impi has the volume details-- and make a decision then

forcecooled · Post by **forcecooled** » Wed Oct 31, 2007 6:48 pm

In any case , nothing wrong with a bit of a higher C/R up on the highveld just watch the spark advance and listen for pinging! Dont drag a Jurgens up a long hill in 4th with a flat foot as well most T4's were screwed by abuse, intentional or not. They should have come out with cyl head temp and EGT guages AND knock sensors. LOL!
Seriously, van engines had to be the most abused on this planet.