AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
- Messages
- 24,933
- Reaction score
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Your cam specs are 274/284/110 and 224* @050; with lift of .538/.534..That is a pretty nice street cam.
That dual diaphragm was barely ok with my 223* cam. After doing all the external checks and finding nothing wrong with mine,I took mine apart to prove it was ok. And it was.So I drove it that way. It was lazy from time to time. Lazy meaning slow to build boost if too much time spent at low rpm. When I went to the 230* cam it became intolerable. It may be that your idle vacuum is a bit low to charge the chamber. It may be that your checkvalve is leaking. It may be that the pushrod adjustment is in need of changing. Or it may be that your booster is just not up to the task.. There is enough info in this thread to determine which it may be.
From your description, I think I would swap it out; but be prepared to fine tune anything you replace it with.Best of luck to you. Nice cam. She wants about 14* minimum initial timing to build vacuum and a fairly slow rate of advance to prevent detonation. I ran mine on 87E10 with aluminum heads and 10.7 C/R.I really loved that combo.Gobs of torque and great gas-mileage.T
That dual diaphragm was barely ok with my 223* cam. After doing all the external checks and finding nothing wrong with mine,I took mine apart to prove it was ok. And it was.So I drove it that way. It was lazy from time to time. Lazy meaning slow to build boost if too much time spent at low rpm. When I went to the 230* cam it became intolerable. It may be that your idle vacuum is a bit low to charge the chamber. It may be that your checkvalve is leaking. It may be that the pushrod adjustment is in need of changing. Or it may be that your booster is just not up to the task.. There is enough info in this thread to determine which it may be.
From your description, I think I would swap it out; but be prepared to fine tune anything you replace it with.Best of luck to you. Nice cam. She wants about 14* minimum initial timing to build vacuum and a fairly slow rate of advance to prevent detonation. I ran mine on 87E10 with aluminum heads and 10.7 C/R.I really loved that combo.Gobs of torque and great gas-mileage.T