can use turbo valve springs on non turbo

[944-85.5-white]

year 944 85.5

can you use 944 86-89 turbo vavle springs on a non turbo 944 85.5? they are alot cheaper and stiffer but are they the right size.
my quess is probably not since the vavles are different. just trying to save some cash.

[AznDrgn]

Yes you can

[944-85.5-white]

thanks they have them here for turbo 86-89 for $17.00 per valve non turbo are $40 per valve. why i just don't know

[944mech]

Does anybody know why the turbo springs are cheaper than the N/A?

Im not to familiar with camshafts and valves and valve springs but would there be any kind of a performance improvement from using the turbo springs?

Or would it possibly hurt performance due to the engine having to work harder to compress the stiffer springs?

[Techno Duck]

Im not sure why they are cheaper, i know Lindsay Racing sells a set of after market valve springs which are cheaper than the OE ones. Perhaps thats why.

I think a stiffer spring will be good for anyone looking to venture into the high RPM area or who spends alot of time in this area. The stiff springs will help prevent valve lift.

Again i think thats the benefit of stiffer valve springs. I could be wrong.

[Razorback1980]

Jon, you are exactly correct. At high rpms, softer springs do not always have time to close the valve completely and the compression suffers .....as Jon already stated. Stiffer springs will fix that if you are having that problem. So, if you are floating valves, then yes, stiffer springs will increase performance. There shouldn't be a degradation from stiffer springs or if there is, you won't be able to tell it.

[944mech]

Whats considered high rpm in the 944?
5000-7000 ?
I know the stock rev limit is like 6200 or something close to that
Would stiffer springs be ok on a daily driven 83?

I do see 5500 rpms at least a few times a week but thats about as high as I go because the power ends right there. But the car is capable of reaching 7k due to the FRWilk dual chip adaptor board and chip I installed.

Would this rpm be safe to go to on a car such as the 83 with the stock internals? The head has been rebuilt and machined down but only a very little bit to clean it up and all the important parts such as belts and injectors and such have been replaced.

Sorry for stealing your post, ive been curious about this part of the engine and wondered what kind of benefits could be seen from using stiffer springs.

[Rick V]

Are your stock springs single or double? What are the turbo springs? The other thing to check is the installed spring pressure, and make sure you balance all the springs.

[944-85.5-white]

thanks, I have not checked yet. they use different vavle springs on 86-89 944 turbo. well a different part #. i just wanted to know if i could use them instead of the standard 83-88 valve springs on a non turbo 85.5 944. $40 per valve spring non turbo vs $17.00 for turbo valve springs, if you purchased them at pelican parts.

[AznDrgn]

The NA's use double springs and I believe the turbo's use the same just different rates.

[HondaDustR]

Originally posted by 944mech
Does anybody know why the turbo springs are cheaper than the N/A?

....

Probably because the turbo springs are aftermarket (listed as "Scherdel" brand), and the N/A springs are OEM.

[ERAU944]

as long as proper maintenance has been done, you can run the car to redline all you like. trust me :-D




disclaimer: obey all speed limits and other laws of the road. do not attempt to race ricers, muscleheads, motorcycles, or soccer moms. do not: talk on the cellphone, eat, sleep, read, paint your fingernails/toenails, do your makeup, close your eyes, or take sedatives while driving the Porsche 944 or any other motor vehicle. make sure there is the proper amount of oil and coolant in your engine. fuel is optional, but lack thereof will reduce the overall driving experience, and enhance the overall walking experience. enjoy the drive, that is all!

[JivenJim]

I think the Turbo Springs have about 25% higher rating. This will help higher rpms as the other guys pointed, but will slam the hydraulic lifters harder. If lifters are marginal, they might start to bend and thus loose valve lift and power. They'll make some noise to let you know if that is the case. Clark has some indicators on his CAM write-ups.

[944-85.5-white]

thanks,

I notice that. I would probably have to get the aftermarket (Scherdel)turbo valve springs. $40.00 for O.E.M valve spring per valve is the best price I have found, but still to much. I notice that the 944s/s2 (Genuine) porsche valve springs are $12.25 per vavle inner/outer.

It looks like O.E.M parts are better then Genuine build Porsche parts based on price. although, there might be a difference between the 83- 89 944 and the 944s/s2 valve springs that caused the big difference in price.

[rockfan4]

The S and S2 are 4 valves per cylinder, the springs (and valves) are completely different.

[944-85.5-white]

thanks for the info.