Flat crankshaft
07-02-2009, 03:35 AM
#31
Racer
Join Date: Apr 2009
Location: Indianapolis
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I don't understand why it would require special cams. Use the 944 cams problem solved (or more readily available aftermarket 944 cams). Don't the 944's have the distributor on the front of each cam box stil? Seams setting the timing correct on the timing belt and getting the ignition going with the correct firing order would about cover it. I realise that implicates two ignition coils firing simultaneously. From what I understand, the 944 heads flow better than the euro "s" heads and fit right on with some minor machining to the base of the cam boxes to alter the alignment angle.
07-02-2009, 05:56 AM
#32
By Entropy Engineering
Firstly the cams on one side would be around the wrong way, as to the flow being better it still wont be good enough to satisfy a full on effort that a flat crank deserves, I have spent a lot of time with the Euro S heads, we now have them flow at the bench mark rate of 80 cfm for a square inch of valve size, bear in mind that the valve is 2.10" I was trying for slightly better which is 85 cfm per sq inch, this is the max for a standard wedge head especially one with a 20 degree angle.
When I asked my guys to get me to the last amount of improvement as the first lot of development has been a joint effort, they said it would take about 40 hrs of R&D time, he said he did 12 flow tests on the last head just on the valve seat to get the best result, so what I am saying is the 44 head is not the be all end all and that it may be a better starting point but I don't want anybody to think it is final say in watercooled front engined porsches.
As I said there is no point to doing this project as the revs are too low to get a benefit and you might run into disaster, when the F1 engine were switched to V8s they had vibration problems and they had to redesign certain systems to cope with the vibration, they have a lot of resources and you would be better off spending on some CNC cams that have some proper lift.
Greg
I don't understand why it would require special cams. Use the 944 cams problem solved (or more readily available aftermarket 944 cams). Don't the 944's have the distributor on the front of each cam box stil? Seams setting the timing correct on the timing belt and getting the ignition going with the correct firing order would about cover it. I realise that implicates two ignition coils firing simultaneously. From what I understand, the 944 heads flow better than the euro "s" heads and fit right on with some minor machining to the base of the cam boxes to alter the alignment angle.
When I asked my guys to get me to the last amount of improvement as the first lot of development has been a joint effort, they said it would take about 40 hrs of R&D time, he said he did 12 flow tests on the last head just on the valve seat to get the best result, so what I am saying is the 44 head is not the be all end all and that it may be a better starting point but I don't want anybody to think it is final say in watercooled front engined porsches.
As I said there is no point to doing this project as the revs are too low to get a benefit and you might run into disaster, when the F1 engine were switched to V8s they had vibration problems and they had to redesign certain systems to cope with the vibration, they have a lot of resources and you would be better off spending on some CNC cams that have some proper lift.
Greg
