What are good lift and duration for a turbo grind cam? It would be VERY helpful if someone had specs for a pushrod motor using a turbo grind cam as well. Thanks

Luke

1998 Mustang GT 5-speed
2002 Lone Star Shelby Cobra Replica

I have a set of 0014 cams from Crane for my Eclipse. Here are the specs:

int. lift .364" int. duration 246 (advertised)
exh. lift .344" exh. duration 238 (advertised)

As for spces on a pushrod motor such as you Mustang motor, I'm not to sure. I believe that most turboed motors like big lift/short duration cams with not a lot of overlap.

Built 420a
NER turbo kit T3/T04s ball bearing
AFX UDP
Crane 0014 cams

The overlap duration is going to be the key. You don't want lopey cams. High overlap causes reversion because, on a turbo head, the pressure is higher on the exhaust side than it is on the intake side. I think a street grind advertised with "good idle"(25-15 degree overlap) should work well if you want something off the shelf. I guess most of the big dogs don't offer a "turbo grind" for the HO, but if you can afford a custom grind then someone should be able to do it. If you do go with a custom grind - they may be able to help you out with designing the profile.

If you do need a custom grind stick with an overlap that offers "good idle". The real trick to a turbo grind is to use a smaller exhaust lift. Smaller lift will allow the exhaust gas to expell at a higher pressure. This makes the turbo spool better. One other great benifit that I can see with the smaller exhaust lift is that it reduces the exhaust duration requirements, which helps to reduce overlap, which in turn helps to reduce reversion. Take a look at the availiable turbo grinds for the 420a. Its not a pushrod, but essentially the overall profile design should be similar to what you would need to make a good turbo grind for any motor - the intake side is a mild drag grind and the exhaust side is a street grind. If you need alot of flow(big turbo) then raise the lift but try to keep the overlap as low as possible - you can keep duration down by making the main event angles as steep as possible.


ride__________95 Eclipse RS : 5 speed
power________Field SFC Hyper-R : Gude cams : Jeep TB : AFX UDP : ram air : test pipe : GST catback
suspention___Hurricane F/R lower strut ties : BOMZ F/R upper strut bars : ES inserts
sound________Kenwood KDC 5000 : Audiovox 8" sub toob - no sub amp(damnit!)
shizzle_______AutoCommand remote start : dual air horns : Caspers o2 simulator(rear)
incomming___Bosal header
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html

95 Eclipse RS : 5 speed
14.76 @ 94.72mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html