Piston Squirters ?????????
#1
Man of many SIGs
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Piston Squirters ?????????
Whats the story with piston squirters on the early 87's? Why were they added? Was Porsche planning a turbo'd S-4? Why were they deleted? HAs anyone had any problems due to having them on their car?
Last edited by Fabio421; 02-22-2007 at 01:25 AM.
#3
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Rumours abound Fabio, I don't know if anyone can definitively say.
The benefits seem evident, to aide in cylinder cooling.
But, they were likely removed because the added windage was causing crankcase ventilation problems with all of the aerated oil.
I've heard stories of some of the squirter block cars experience uneven oil pressure readings, but I haven't personally seen or heard of any major issues. My stroker build is using a squirter block. That should make for some interesting windage issues.
The benefits seem evident, to aide in cylinder cooling.
But, they were likely removed because the added windage was causing crankcase ventilation problems with all of the aerated oil.
I've heard stories of some of the squirter block cars experience uneven oil pressure readings, but I haven't personally seen or heard of any major issues. My stroker build is using a squirter block. That should make for some interesting windage issues.
#5
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Originally Posted by atb
The benefits seem evident, to aide in cylinder cooling.
#6
As I understand it, the squirters only become operational at around 4,000 rpm (about when flappy valve opens, coincidentally??). I have heard stories of the squirters system malfuntioining and still squirting at lower revs thus depriving big ends / main of oil. But I've never met anyone who has 1st hand knowledge of such a problem.
#7
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They come operational when ever oil pump can produce enough pressure to open valves. Stated number is 4 bar. If valves do not function pump can never get pressure high enough to be on normal operating area.
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#11
928 Collector
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There are tons of posts on this topic, bottom line is nobody really knows. I (anectotal i know) remember reading that the squirters were added to all racing Porsches, like the 924 GTR's. The aeration problems are likely the ones that stopped this in the big V8 engine for Porsche.
#13
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Originally Posted by blown 87
What number (vin) did they stop at?
#14
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What adverse effects have owners of 87's with squirters seen due to aeration or is it just one of those things that are "common knowledge"? Does anyone have any pictures of these squirters?