Pull the heads and use this as an excuse to port the hell out of them and do a multi-angle valve job for moar flows. 
Been kinda lurking and watching this post. I love it. Carry on...
Pull the heads and use this as an excuse to port the hell out of them and do a multi-angle valve job for moar flows.
Been kinda lurking and watching this post. I love it. Carry on...
Conquest351 wrote: Pull the heads and use this as an excuse to port the hell out of them and do a multi-angle valve job for moar flows.
Sadly, that costs money. Money that I spent on the new engine.
The seller offered me another head. It is unfair for me to ask for/expect a gasket set as well?
Not at all. After all, you were promised a good motor and he didn't provide it. Even with him providing the gasket set you're out the labor you shouldn't have needed to disassemble and reassemble.
No, those gaskets aren't cheap. I would say at least new head+head gasket (if there is no other damage) would be perfectly reasonable.
Looks like only 3 valves kissed the pistons, I have 3 of the same size valves in my old engine. The seller refunded me enough to buy a gasket set, so hopefully I should be good.
I have only been inside a few engines, but it sure seems like there is a lot of pitting and scoring on the cylinder walls.
It's actually dust/oil streaks from the blow gun
m4ff3w wrote: It's actually dust/oil streaks from the blow gun
Good to hear. Looking forward to the rest of the build!
Bank 1 was the only one with bent valves, luckily the larger of the intake valves on my 2.5 are the same size as both the intake valves on the 2.8. Only 1 valve was damaged in each cylinder. The guy I bought the engine from refunded me more than enough to purchase a gasket set.
With the assistance of Jonny Pruitt one head was fully assembled and valves adjusted w/in spec tonight. The other head is assembled - just needs to be shimmed and cam box installed. That'll happen on Friday.
They are kinda weird/time consuming to shim.. I failed to take pictures.
That picture makes my head hurt. Glad it is working!
I don't think I have ever seen three valves per cylinder before, and wait are the two intake valves working off just one cam lobe. 
I thought that the Stag had an interesting engine. Is it wrong that I want a biturbo engine now?
VonSmallhausen wrote: I don't think I have ever seen three valves per cylinder before, and wait are the two intake valves working off just one cam lobe.
3 valve heads are pretty common, but, if you want to see something interesting, Maserati built a prototype V6 with 6 valves per cylinder.
MG Bryan wrote:VonSmallhausen wrote: I don't think I have ever seen three valves per cylinder before, and wait are the two intake valves working off just one cam lobe.3 valve heads are pretty common, but, if you want to see something interesting, Maserati built a prototype V6 with 6 valves per cylinder.
Too bad it didn't make production - valve adjustment would have been so much easier - no need to remove the cam-box off the head:
MG Bryan wrote:VonSmallhausen wrote: I don't think I have ever seen three valves per cylinder before, and wait are the two intake valves working off just one cam lobe.3 valve heads are pretty common, but, if you want to see something interesting, Maserati built a prototype V6 with 6 valves per cylinder.
F that s!
m4ff3w wrote:MG Bryan wrote:Too bad it didn't make production - valve adjustment would have been so much easier - no need to remove the cam-box off the head:VonSmallhausen wrote: I don't think I have ever seen three valves per cylinder before, and wait are the two intake valves working off just one cam lobe.3 valve heads are pretty common, but, if you want to see something interesting, Maserati built a prototype V6 with 6 valves per cylinder.
I think it's wonderful that it didn't make production. I would need one if it had.
OH! I really want that six valve 
(Honestly five was the most i have ever heard of in the F50)
Adjusting. these. valves. is. a. nightmare.
Still not done.
m4ff3w wrote: Everything about this car is a. nightmare. Still not done.
FTFY.
Keep up the good fight. Who cannot love a 10 page thread about a BiTurbo?
Yamaha makes 5 valves work real nice. The cams act directly on the valves, no rcoker arms.
Sounds like Biturbo valves are as much fun as 9xx Lotus. The procedure: remove the valve covers, check each valve's current clearance via the 'go/no go' method and record this measurement.
Then remove the timing belt (careful, these are interference engines!) then remove the cam towers with the valve 'buckets'. The bad part: the shims are UNDER the bucket and sometimes will fall the hell out. Now you don't know which one went where, dammit. If you are lucky and they don't fall out, measure the shim for each valve, compare the thickness to the original reading, then calculate the shim thickness needed. OBTW: it's the same shim as a SAAB 900 engine, so of course the local PepVanceZone has buckets of 'em dirt cheap. 
Here's the fun part: the cam towers use 518 Loctite which adds about .0015 to the installed height, so you now have to compensate for this. Then, let's not forget that you should add about an extra .001 to compensate for valve seat wear so you aren't doing all this again in 10k miles.
Reinstall the cam towers (again remember this is an interference engine! rotate the crank so the pistons are 1/2 way down the cylinders) and check the valve clearances again. The fun part: you have to use a dab of grease to hold the shim so it won't fall out, this gives a false reading by about .001 -.0015 which you have to compensate for.
If everything is where it should be, now properly time the engine (interference!), make sure the dizzy is somewhere close to right, reinstall the valve covers and fire it up.
AAAAAAARRRRRGGGGGGHHHH.
In reply to Curmudgeon:
BTW, maybe I missed it, but why is the new engine replacing the original that sounded so nice on youtube?
DaewooOfDeath wrote: In reply to Curmudgeon:
A freak accident caused the a/c compressor belt to get behind the timing cover and between the timing gear and timing belt.
In reply to m4ff3w:
So you have lots and lots of bent valves, spread over two engines. Good luck.
DaewooOfDeath wrote: In reply to m4ff3w: So you have lots and lots of bent valves, spread over two engines. Good luck.
6 bent valves over two engines. The new 2.8 came w/bent valves.
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