| 2:38 PM (9 hours ago) | |||
MO,It all depends on several factors, but for simplicity sake, a “long duration” cam will act smaller in a large cubic inch engine than it would in a small block; ie my 284/.484” ([email protected]”) Hyd. Purple Shaft in my 340 Dart is very “lumpy” at idle with a 108LC and would diminish vacuum signal from power brakes if I had them...although not unworkable, just not optimum. These are “guidelines” and your best source for accurate information is from the cam mfgr. regarding a particular grind you choose...or their recommendation for your specific application.Gary P.By the way , what characteristics would a cam with .475 lift on intake and exhaust, with a long duration have? I am going to guess a torque cam? .............................. .....MO
On Friday, April 28, 2017 at 1:08:01 PM UTC-5, MO wrote:I am not much up on cam specs and what they mean as far as degrees. So, I assume a cam could have a comparitivly long duration without all that much lift? . My cam measures approx .475 lift on intake and exhaust and looks like quite a bit of duration. Could that be why I have very little vacume on a gauge? I know I don't have any leaks......................... ............MO
On Friday, April 28, 2017 at 12:04:55 AM UTC-5, glpav...@xxxxxxx wrote:MO,Any long duration camshaft, regardless of vehicle brand, will yield a low vacuum signal and require a vacuum pump booster to operate a power brake system; ie. 284 adv. duration [email protected]”...Gary PavlovichI had heard that some cams cause power brake cars problems. A friend started up his El Camino, and I thought from the clicking sound it made, that he had an electric fuel pump. No, he said he had to put on a vacume pump for his brakes to work right. I had never seen one before. Is this common among Mopar engines with certain cams?......................... ......MO--
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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
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