Timing chain instead of a belt. Would it be possible?
#16
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i think the biggest issue is to have the timing aligned
its one thing to have your rear wheels powered by a chain than the extreamly sensitive cylinder head operation.
while cool, if the engine isnt designed for it, i would see no real benefit for conversion.
chains can be just as destructive as belts if not constantly inspected.
its one thing to have your rear wheels powered by a chain than the extreamly sensitive cylinder head operation.
while cool, if the engine isnt designed for it, i would see no real benefit for conversion.
chains can be just as destructive as belts if not constantly inspected.
#17
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Okay, so lets see now.
timing chain ... bad
back to bed ... good
But then I thought ... what about a gear drive?
(just joking)
-----------------------------------------------------
Alex Portanova
1989 944 N/A
1999 Chrysler 300M
1992 Harley FXSTC
timing chain ... bad
![nono](https://rennlist.com/forums/graemlins/nono.gif)
back to bed ... good
![thumbup](https://rennlist.com/forums/graemlins/thumbup.gif)
But then I thought ... what about a gear drive?
![ducking](https://rennlist.com/forums/graemlins/icon107.gif)
(just joking)
-----------------------------------------------------
Alex Portanova
1989 944 N/A
1999 Chrysler 300M
1992 Harley FXSTC
#19
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Well, the easiest way to have a timing chain in your car would be to install a 944S/S2/968 motor. They have a timing chain in the head. You still got the belts to deal with but you gain 40 to 90hp.
#21
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Originally Posted by Legoland951
944s/s2/968 all have timing belts driving the cams from the crank.
![](http://www.clarks-garage.com/graphics/time5.jpg)
#22
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I understand the inner working of a 944 16 valve cars as I have one taken apart right now. I think the whole conversation is from the crank pulley to the cam shaft.
#23
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If having a timing belt was truly a problem, they would have stopped using them in new cars, but they still use them. There's nothing really wrong with it, it has pros and cons.
#24
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the increased enertia of the chain is a horror show i've never seen a chain that long when you lift your foot of the gas often the cam wont want to slow as quick as the crank and the enertia of the chain is a real issue in it self destructing why ferrari whet single row chain over double . use your time and effort getting generous valve reliefs in the pistons so its no problem breaking the belt and get a gates belt heaps better than the conticrap oem
#25
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Originally Posted by FRporscheman
If having a timing belt was truly a problem, they would have stopped using them in new cars, but they still use them. There's nothing really wrong with it, it has pros and cons.
#26
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Originally Posted by gt37vgt
the increased enertia of the chain is a horror show i've never seen a chain that long when you lift your foot of the gas often the cam wont want to slow as quick as the crank and the enertia of the chain is a real issue in it self destructing why ferrari whet single row chain over double . use your time and effort getting generous valve reliefs in the pistons so its no problem breaking the belt and get a gates belt heaps better than the conticrap oem
#27
Jane Bond 007
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Just an FYI on this:
I am helping my son rebuild the engine in his 2000 Ford Contour SVT. Believe it or not, the engine was designed by Porsche and Ford bought the design and mass produced it in the Contours and Cougars. It is a 2.5L 6-cyl. It has the same oil pump and crank girdle design as the 944, but has dual OHC run by chains with hydraulic tensioners. I've always wondered if this may have been where the 968 engine was going to evolve before Porsche killed the series. The Contour's production started in '95.
I am helping my son rebuild the engine in his 2000 Ford Contour SVT. Believe it or not, the engine was designed by Porsche and Ford bought the design and mass produced it in the Contours and Cougars. It is a 2.5L 6-cyl. It has the same oil pump and crank girdle design as the 944, but has dual OHC run by chains with hydraulic tensioners. I've always wondered if this may have been where the 968 engine was going to evolve before Porsche killed the series. The Contour's production started in '95.
#28
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The new Audi V8 has chains, I think they are at the back of the engine. It's not a bad idea going forward but retrofitting a chain to a street engine would be insanely expensive. Chain, sprockets, hydraulic tensioner, oiling system, covers, revised waterpump and plumbing, balance shaft delete, ugh.
If you just slap some motorcycle parts on there you'd probably have a system that would not last as long as a belt and it'd make a huge mess. It'd also be really loose until the engine heated up.
If you just slap some motorcycle parts on there you'd probably have a system that would not last as long as a belt and it'd make a huge mess. It'd also be really loose until the engine heated up.
#29
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Forgot to add:
They cured the water pump issue by mounting it on the backside (actually, left side as the engine is transverse mounted) and running it off of the camshaft.
They cured the water pump issue by mounting it on the backside (actually, left side as the engine is transverse mounted) and running it off of the camshaft.
#30
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Originally Posted by MichelleJD
Just an FYI on this:
I am helping my son rebuild the engine in his 2000 Ford Contour SVT. Believe it or not, the engine was designed by Porsche ...
I am helping my son rebuild the engine in his 2000 Ford Contour SVT. Believe it or not, the engine was designed by Porsche ...
http://en.wikipedia.org/wiki/Ford_Mondeo_V6_engine