DubNation
Veteran Member
PHP:
......like what the brits call semi's?What. Who's Lorry?
or
"lol oh rly"= lorry?
im as confused as u, i think hahaha
......like what the brits call semi's?What. Who's Lorry?
Im reading this subject while doing research for a lighter injection pulley for my ALH motor. I have to disagree with this statement...a lighter injection pump pulley should do wonders for timing belt life compared to running a TDI with a heavyweight VE pump pulley if your using high RPMs. That is my reason for the search. I just wish I could find someone in the UK who would like to work with a Yank on getting some UK/Euro parts shipped to me for my build.Lightened pulleys/sprockets will do absolutely squat, compared to reducing the weight of the flywheel by the same amount because 1) moment of inertia is related to the square of the diameter, I=mr², and a sprocket/pulley is of a much smaller diameter than the flywheel; 2) the kinetic energy required to rotate a sprocket/pulley is related to the square of the angular velocity, T=0.5*I*omega², and the camshaft/injection pump sprockets turn at half engine speed.
The best bang for the buck in terms of reducing rotational inertia in order to improve vehicle acceleration is to reduce weight at the wheels, because the moment of inertia is multiplied by the square of the overall gear multiplication ratio, multiplied by the fact that you have 4 of them.
its what they call a truck across the atlanticWhat. Who's Lorry?
Sure about that, I've done both ALH pumps and never seen a lightweight 11mm pulley?Thanks
But the ALH auto 11mm pump has the lightweight pulley as standard (and the AHH longitudinal version) so why did VW choose to make these light for a reason? Something to do with the auto?
I don't see why VW did both specs? Its not like one was phased out due to issueS?
ALH Automatic has always 1.8kg pulley (038130111B) like others. AHH has lighter 0.6kg pulley (028130111J).But the ALH auto 11mm pump has the lightweight pulley as standard (and the AHH longitudinal version)
ikr, I'm thinking about making one out of brass for the increased density.@p0wer, there's also a 038130111A. Do you know what that's for and its weight?
Geez, some people want the lighter pulley, I want the heaviest one!
According to ETKA it is used some 2001 and earlier model G4/Bora and it is replaced with 038130111B afterwards(10/2000). I think it is heavier pulley also, atleast it looks the same.@p0wer, there's also a 038130111A. Do you know what that's for and its weight?
I've had many IP failures, and never got problem with timing belt. I had many (atleast 5) broken crosscube, couple broken camplate pins, and when every other part survived, of course stucked & cracked plunger(11mm & 12mm) was next on the list.Then the real reason for making one when they're available on the shelf, make it with a shear pin in it on a running fit (maybe a ball bearing sorta like an A/C pulley), so that any kind of injection pump failure will not take the timing belt with it.
Thank you for the information before I went out and spent many hours making a part that wouldn't really do what I wanted of it.I've had many IP failures, and never got problem with timing belt. I had many (atleast 5) broken crosscube, couple broken camplate pins, and when every other part survived, of course stucked & cracked plunger(11mm & 12mm) was next on the list.
Your idea is good, but maybe it is not necessary because something will give up inside the IP anyway and keeps timing belt unharmed?
Got a part number for the plunger return springs? They're the last bit I'm looking for for the 12mm pump head I've got laying around, got the same plans with the gentler 10mm pump camplate.My car has a 12mm plunger in an otherwise stock 10mm pump. I don't want any surprises when the TB approaches close to the replacement interval.
The shaft and those ears are quite strong. Definitely something else will give up than them. I am still using the same shaft that was used during those all "experiments" which I mentioned before.Thank you for the information before I went out and spent many hours making a part that wouldn't really do what I wanted of it.
I can definitely see the t-belt being stronger than the ears on the end of the injection pump's shaft. Once those are sheared the pump input shaft will more or less freewheel as the engine coasts to a stop. Even if something were to catch in the transfer pump, the key would shear.