greengeeker
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How bad?
Now now, that's not very nice - you shouldn't have said anything then !!I will let Pierre tell us how bad since I was not there today!
Jeff,Hi Pierre,
Did you blueprint (measure and remeasure) this rebuild? When you grind the head, it may lower the valve placement by that much in the cylinder bore. Glad to hear you clearanced your pistons, but you should know (calculate/measure) the clearances, not guess. I usually cc the combustion chambers for custom builds, and also use modeling clay to check squish clearances. Simply place 2x 1/4" balls of soft modeling clay on either side of piston crown and bolt on head with HG in place and rotate piston up into TDC. Remove head and see the physical clearance in the smashed clay. You can heat the clay with hot air and harden it for future show and tell. Did you use gapless rings? What are your ring gaps if not? Did you also plastigage mains and rods?
Good luck with the build.
TDI's are simple like lawnmowers, just be glad you are not putting back together a TT225 AWD BT car!
Jeff
As long as you keep it the same (or a bit more) as the engineers designed it, valves won't bump heads with pistons, rings won't bind, etc. I've seen too many builders F-up motors by blindly reengineering tolerances, and choosing wrong HG's, etc. btw, I just learned of a shop using a "one-hole" gasket on a highly modified motor, that can't be good! (for those who don't know, HG's come in 3 sizes with 1/2/3 hole markings denoting the thickness)Jeff,
That's a great idea on how to check for clearance and very simple, too!
So deepening the pockets is only 1/2 of the equation when installing a rebuild/machined head. The other 1/2 is making sure the clearances stay close to factory specs by using the appropriate HG's thickness after measuring for clearance. This is great info and easy to digest ...As long as you keep it the same (or a bit more) as the engineers designed it, valves won't bump heads with pistons, rings won't bind, etc. I've seen too many builders F-up motors by blindly reengineering tolerances, and choosing wrong HG's, etc. btw, I just learned of a shop using a "one-hole" gasket on a highly modified motor, that can't be good! (for those who don't know, HG's come in 3 sizes with 1/2/3 hole markings denoting the thickness)
Jeff
Hi Pierre,
Did you blueprint (measure and remeasure) this rebuild? When you grind the head, it may lower the "resting" valve placement by that much in the cylinder bore, (adding to increased lift from sport cam too). Glad to hear you clearanced your pistons, but you should know (calculate/measure) the clearances, not guess. I usually cc the combustion chambers for custom builds, and also use modeling clay to check squish clearances. Simply place 2x 1/4" balls of soft modeling clay on either side of piston crown and bolt on head with HG in place and "carefully/manually" rotate piston up into TDC. Remove head and see the physical clearance in the smashed clay. You can heat the clay with hot air and harden it for future show and tell. Did you use gapless rings? What are your ring gaps if not? Did you also plastigage mains and rods?
Good luck with the build.
TDI's are simple like lawnmowers, just be glad you are not putting back together a TT225 AWD BT car!
Jeff
If you need putting mileage on it i am planning a long trip this coming week - about 1000 miles of driving! Let me know if I can be of any assistance! I will cover partial fuel cost
BTW, how is it driving now? Pulling harder?
The TDIs are interference engines. The piston valve pocket never is deep enough to let the cam get out of time. In certain performance situations (RPM, equipment and timing retard / advance) valve contact can take place. When RPM is higher there needs to be more clearance. The hydraulic followers used in the TDIs do not have a limit to pump up (either clip or retainer). There is a clip to keep the hydraulic part of the follower in place, but nothing to limit pump up. IMHO the more you plan to rev a TDI follower, the more care you should use to give extra clearance. You especially have to be more careful when using different cam profiles and cam installation timing (retard / advance).Tnx for the advice Jeff...
No, I did not do the modeling clay to measure the clearance. I just measured how far the valves stick out (without the cam tightened down) and used the one which sticks out most to do my ghetto calculations.
I did not go for gapless rings this time either and did not gap the rings. I just put them in as it.
here is my ghetto blue print and how I arrived at clearances..
Seems to be working good... lots of smoke though but I thing this is from the injectors set to max fueling. It should work well with the 2260vk which is hopefully on it's way.
Where are you going for 1000 miles? LA and back?
Excellent! Glad you've got the Golf back on the road. Always double-check your work, though (cam seal). Next time...Ok, I am back on the road.
Sat and Sun going skiing, then heading home, changing the content of the car, Mon-Wed near Lancaster, Fri-Sun in San Diego.Seems to be working good... lots of smoke though but I thing this is from the injectors set to max fueling. It should work well with the 2260vk which is hopefully on it's way.
Where are you going for 1000 miles? LA and back?
... PD150 Airbox, PD150 Turbo Inlet Pipe, PD150 Intake, PD150 EGR and VNT17 coming by 2011 year's end!
thanks,i did tweak it alittle from the other head.wait till you get the big turbo on.Put another few miles on the rebuilt motor... She pulls frickin hard...
Bill the new head is AWESOME... I think it pulls even harder than before .... did you put some secret spice in there? leaned a little harder on the dye grinder? Whatever you did..... it is dope!
How much harder can the little white beast pull? Last year when I rode in the car with you a WOT just inflicted pain in my back! It would be fun to take her on a track with banked curvestothemax; Put another few miles on the rebuilt motor... She pulls frickin [I said:hard[/I]...
Bill the new head is AWESOME... I think it pulls even harder than before .... did you put some secret spice in there? leaned a little harder on the dye grinder? Whatever you did..... it is dope!
Are you free Feb 6th? Laguna Seca You will need a SNELL helmetHow much harder can the little white beast pull? Last year when I rode in the car with you a WOT just inflicted pain in my back! It would be fun to take her on a track with banked curves
Buying my helmet today! I was going to go to the GTG in ORregon but this sounds like an opportunity not to be missed ...Are you free Feb 6th? Laguna Seca You will need a SNELL helmet
That's GREAT!! I think MAXRPM is coming too.Buying my helmet today! I was going to go to the GTG in ORregon but this sounds like an opportunity not to be missed ...
That GTG is actually on MARCH 6th maybe a few of us could caravan?Buying my helmet today! I was going to go to the GTG in ORregon but this sounds like an opportunity not to be missed ...
+- 17,000 mi on the 17/22....how many miles are on your 17/22?
Eager to hear your findings after the big boy turbo and remap. I think you'll still say MOFO, just in a much larger fontYeah!! Wayy too much fun.. Pulling like a MOFO!! 1500 miles on the new rings...
Going to put in the 6 speed this week.... Big boy turbo on the way..
not much to report at the moment