Are roller cam followers available for Minis?
Just as you'd see in a high RPM V8?
| ausmini https://ausmini.com/forums/ |
|
| Roller cam? https://ausmini.com/forums/viewtopic.php?f=5&t=70150 |
Page 1 of 1 |
| Author: | Stuwey [ Fri Apr 15, 2011 2:32 pm ] |
| Post subject: | Roller cam? |
Are roller cam followers available for Minis? Just as you'd see in a high RPM V8?
|
|
| Author: | GT mowog [ Fri Apr 15, 2011 2:46 pm ] |
| Post subject: | |
I doubt it. The shape of the Lobes used for Roller Followers is quite different to that for flat tappet type (like those in the A series). I think a few have played around with trying roller followers but effort / advantage doesn't tallyup too well. They are also heavier than a flat tappet and so your valve springs and possibly push rods need a serious review. Can I ask why your asking? |
|
| Author: | drmini in aust [ Fri Apr 15, 2011 2:48 pm ] |
| Post subject: | |
We have been through all this before... yes, it has been tried- there is just not enough room in there to get decent performance cam profiles and lift with a roller cam. 
|
|
| Author: | TheMiniMan [ Fri Apr 15, 2011 3:20 pm ] |
| Post subject: | |
one of (or at least one that i knew of) speedway guys up here , (year & years ago) had a roller cam & lifter arrangement, the thing was quick but i couldn`t tell you if the performance had any relationship with the roller lifters, to be honest i think it actually did a bit,,, but i didn`t build the engine, & i never drove the thing, but i knew what it was like before & after the opperation, & yes there was significant difference,,, however, when doing a job like that there is also the new rings & bearings & re-seat of the valves as per usual re-build a race motor type of standards,,, so maybe it was crisper & cleaner & quicker simply because of the re-build??? don`t forget the extra weight of them tho,,, |
|
| Author: | mini_mad_matt [ Fri Apr 15, 2011 6:10 pm ] |
| Post subject: | |
Have many people played around with needle roller bearings for the camshaft? |
|
| Author: | 850man [ Fri Apr 15, 2011 9:22 pm ] |
| Post subject: | |
mini_mad_matt wrote: Have many people played around with needle roller bearings for the camshaft?
Nevelle Watts was doing it to Peter Mantons engines is the 60s. 
|
|
| Author: | TheMiniMan [ Fri Apr 15, 2011 11:11 pm ] |
| Post subject: | |
i think Gulson or someone i know played around with that, i`m getting old, who are you anyways & what are you doing typing into my microwave oven??? |
|
| Author: | mini_mad_matt [ Sun Apr 17, 2011 5:14 pm ] |
| Post subject: | |
Don't know about Gulson but Murray was doing it too. Every now and again he pulls out the camshaft and tells me the story on what you need to do hehe. It's one of his stories on a 6month rotation. 
|
|
| Author: | drmini in aust [ Sun Apr 17, 2011 11:33 pm ] |
| Post subject: | |
Camshaft needle bearings are just another hardened part to drop into the gearbox and cause even more havoc... 
Although I guess on race motors, the windage tray helps in catching these bits-
|
|
| Author: | Stuwey [ Mon Apr 18, 2011 5:18 pm ] |
| Post subject: | |
GT mowog wrote: Can I ask why your asking?
A good friend races a pair of Aermacchi classic motorbikes and keeps wearing out cams every-other race meet or thereabouts and was on the hunt for more reliability, and maybe some extra horsepower. He's only got about 3/4" to machine in the barrel for something to fit, most V8 stuff whilst easy to obtain is too large. Thanks for all your replies, much appreciated. |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|