Roller lifters, Anyone tried them? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Roller lifters, Anyone tried them? |
r_towle |
Oct 26 2015, 09:31 PM
Post
#1
|
Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Has anyone tried roller lifters in a type 4, or any flat motor?
|
Jake Raby |
Nov 3 2015, 11:07 AM
Post
#2
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
This thread is wildly off topic. When anyone who wants to try this posts purely technical questions, or comments, I'll be willing to weigh in again.
|
Mueller |
Nov 3 2015, 12:48 PM
Post
#3
|
914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
This thread is wildly off topic. When anyone who wants to try this posts purely technical questions, or comments, I'll be willing to weigh in again. Is the cam base circle increased or decreased with the roller cams? I would guess it depends on the rod clearance or did you pick one cam base circle and stick with it for all builds? I stumbled upon some Mack truck roller lifters that use ceramic rollers, ever play with that style roller? I almost want to buy one at $25 just to check it out! |
Jake Raby |
Nov 3 2015, 10:24 PM
Post
#4
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
This thread is wildly off topic. When anyone who wants to try this posts purely technical questions, or comments, I'll be willing to weigh in again. Is the cam base circle increased or decreased with the roller cams? I would guess it depends on the rod clearance or did you pick one cam base circle and stick with it for all builds? I stumbled upon some Mack truck roller lifters that use ceramic rollers, ever play with that style roller? I almost want to buy one at $25 just to check it out! Base circle is dependent upon the ramp speed that you intend to apply. The ramp speed, and the wheel diameter are critically related, as the roller can stall, or loft off the nose of the lobe. Base circle is also dependent upon the way you have indexed the lifter. The diesel rollers are a poor choice, because they are designed for low RPM, and slow ramp rates. Their axles can't take high speeds well, and the lifters themselves are very heavy, which adds more necessity for valve spring rate. |
Lo-Fi Version | Time is now: 16th June 2024 - 04:03 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |