| fusername |
Fri Jan 09, 2009 11:31 am |
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| I was curious if there is a difference between porsche valve springs (021109623E) and bus valve springs, which I can not find. |
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| melville |
Fri Jan 09, 2009 2:51 pm |
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fusername wrote: I was curious if there is a difference between porsche valve springs (021109623E) and bus valve springs, which I can not find.
Not sure if this will describe it to you, or if it even represents the difference. The first time I rebuilt my T4, the machinist had me pick through a 5 gal bucket of valve springs to get a matched set that would give 80 lbs pressure at 44mm height. The ones that didn't give 80 lbs gave about 65 lbs.
I had the impression that that bucket was all T4 springs and there were two other buckets with T1 springs. I don't know if the difference was VW/Porsche or if it was solid/hydro or something else entirely.
Unless you have a bucket available to you to pick the best 8 out of 100 30+ year old springs, getting a new set from a certain Georgia vendor is cheap insurance. The springs I rejected were bent, stretched, sagging, rusty, you name it. I would not have been able to pick another 8 springs out of that bucket. |
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| fusername |
Fri Jan 09, 2009 8:06 pm |
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| sadly the bucket got thrown in the trash, but I filled a gal bag with what was on top. Turns out hydro are harder than solid, but porsche seem to be a mystery all around. |
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| Bleyseng |
Sat Jan 10, 2009 7:32 pm |
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As far as I know the Porsche 914 valve springs were the same as a bus,411/412 as all the engines were built in the same factory, same lines just on different days...same redline 5400...
Run the HD ones from Jake as they do give you more rev...besides who wants 30 yr old valve springs... |
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| fusername |
Sun Jan 11, 2009 6:24 am |
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| I always just assumed 914s had a higher redline, but never really looked into it. thanks for the info, that changes things a bit. |
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| raygreenwood |
Fri Jan 16, 2009 3:39 pm |
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Except for the 2.0L...there is no difference in a single part between VW type 4 411/412 and Porsche 914 in the 1.7L. Every single part down to the last part number (save for some differnt sheet metal peices and a differnt marking on the fan pulley).....is exactly the same.
The only difference in the 1.8...may have been the pistons on some years of the bus 1.8...but the 914 and 412 1.8 were the same. Valves, heads, cam, springs, pistons, cranks, rods...all of it.
The differecne comes between the bus and 914 2.0L.
Crank is the same, block the same, rods the same....cam, cylinders, pistons and heads are different. The cam in the 2.0 is identical to the 1.7L. Ray |
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| fusername |
Fri Jan 16, 2009 4:50 pm |
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| Thanks ray, that is some useful stuff. I always thought the 1.7 had domed pistons for higher comp, or are those after market only. |
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| Bleyseng |
Fri Jan 16, 2009 6:31 pm |
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Yep, 914 and 411 W or EA 1.7 motors came with domed 90mm pistons for 8.2 to 1 CR vs the Bus CB motor with its dished pistons...
The valve springs are the same but don't even think about using old springs. :roll: |
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