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| 731 camshaft https://www.ausmini.com/forums/viewtopic.php?f=5&t=13041 |
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| Author: | willy [ Thu Nov 10, 2005 10:58 pm ] |
| Post subject: | 731 camshaft |
Okay with my A+ 998, i think i'll go the 731 route for cam. Does it have a kinda lumpy idle? I've been told its a road rally spec item, whatever that means 
So yep, whats this cam like. Any recommendations. Its going with a weber, and i like my brap brap lumpiness 
Prices too? is this cam available new? or what is the cost of a grind on a standard cam. cheers. will. |
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| Author: | supercharged 850 [ Fri Nov 11, 2005 1:46 am ] |
| Post subject: | |
The 731 would be my most favourite "budget" small bore cam. Yep, its as lumpy as your grandma's gravy  Have a listen to Bob's morrie when he brings it to the workshop next. He has one in that.
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| Author: | drmini in aust [ Fri Nov 11, 2005 6:22 am ] |
| Post subject: | |
Yeah a 731 is OK in smallbores, I ran one for years- but there are better ones about now. RE13 is the best sports one I've found. Way better midrange and top end. |
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| Author: | gafmo [ Fri Nov 11, 2005 7:39 am ] |
| Post subject: | |
yer we had a 731cam for 2 years..and I liked it..replaced it with a RE13 Just that little bit better
Still have the 731 here |
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| Author: | Rodney [ Fri Nov 11, 2005 7:45 am ] |
| Post subject: | |
Umm.....sorry about the dumb question guys - I know there are all sorts of different cams but how do you tell one from the other???? Is it just experience?? Cheers |
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| Author: | drmini in aust [ Fri Nov 11, 2005 1:27 pm ] |
| Post subject: | |
Pretty much is. I've had about a dozen different cams in roadgoing Minis over the years. All the cam grinders say theirs is the best, but a dyno is the great arbiter. At our last Dyno day pretty much the top 10 (except for Ron's) all ran an RE13.
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| Author: | Rodney [ Fri Nov 11, 2005 8:48 pm ] |
| Post subject: | |
Thanks Doc. Does a RE 13 cam keep the valves open for a longer period of time or something??? Cheers |
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| Author: | willy [ Fri Nov 11, 2005 8:51 pm ] |
| Post subject: | |
Yeah and whats the idle like, between the two cams. |
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| Author: | drmini in aust [ Fri Nov 11, 2005 9:45 pm ] |
| Post subject: | |
Rodney wrote: Thanks Doc. Does a RE 13 cam keep the valves open for a longer period of time or something???
Cheers A bit more duration, bit more lift, bit more opening & closing acceleration. 731 is 268* duration and .252" lift (at cam), RE13 has a little more duration but but a lot more lift (.290" at cam). If you use `em with 1.5 rockers, to avoid coil bind you will need C-AEA526 valve springs (which have 1 less coil). willy, the idle is about the same.
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| Author: | gafmo [ Sat Nov 12, 2005 11:03 pm ] |
| Post subject: | |
RE is slightley lumpier.. |
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| Author: | Stuwey [ Sun Nov 13, 2005 10:08 pm ] |
| Post subject: | |
I used to have a 731 in my hottie 998 van, willy. When it was out of tune, it sounded like a bloody rotor. Brap, brap, brap. But that was with a 12G295 head, and twin 1-1/4 SUs. That thing used to go alright for a 998. |
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| Author: | Spaceboy [ Mon Nov 14, 2005 12:27 am ] |
| Post subject: | |
having been the only cammy motor i've driven, it gets going from about 2500-3000rpm with the real power kicking in at 3000 still going nicely to 6000+ its an old works rally cam, so its been surpassed by more modern profiles. the idle is a little bit lumpy, but not enough to piss me off.. i hate lumpyness and general lack of smoothness. |
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| Author: | Stuwey [ Wed Dec 07, 2005 10:42 pm ] |
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Spaceboy wrote: i hate lumpyness and general lack of smoothness.
So remind me why you drive a mini 
I like my Scatter pattern cam because it doesn't lump like the rest. A little less attntion from the boys in blue
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