ausmini :: View topic - 12G295 head & RE83 Cam

RE83 needs good springs due to valve acceleration rate.
I'd use C-AEA526 springs, available from Minispares, Karcraft and elsewhere.
These are 180lb, which is plenty. They work well with an RE83 cam, both on smallbore and 1275 heads.
Pretty cheap to buy, and made from good material.

I refused to read any more of your post after it said you weren't planning to rev it past 6500 Rusty

hehehe

drmini in aust wrote:

Kev,
At what height, length are these springs "C-AEA526" measuring 180 lb..
Thanks,
Dave

Hi low and blown

The mini spares AEA526 springs measure 98lb @1.4 and 85lb @1.42
The isky springs that you speak of have a spring rate of 320 lb the 526 have a rate of 300lb.
The isky spring was only ever designed for .375 lift at the valve
The best thing that happened to the terry springs is that you can not get them any more, the morris 1100s outers and Cooper S inner were a much better combination and still work well to day.
The std Cooper S springs run 75lb on the seat with a very mild cam so any sports cam today should be run @ 85/95 lb on the seat (mini's)
I laugh at people when the say my road cams are to aggressive and need to much spring when they have no idea what they are talking about
I have lot of cams running in motors both here and over seas that don't have any problems as in cam and follower wear providing the followers have been ground correctly.
Graham Russell

Author:	68Rusty [ Wed Jun 24, 2015 6:59 am ]
Post subject:	12G295 head & RE83 Cam - Which valve springs to use
Hi all, If I were in a metropolitan (Sydney) area I would probably get GR to set up a 12G202 but for now I have a 12G295 head with RE83 cam which will still be nice combination I hope. I have double valve springs from a 12G202, Double valve springs from STD deluxe head and the springs that are coming with the 12G295 I have bought. I don't plan to be reving this engine past 6500rpm, can someone recommend best valve springs I can use (or get away with) or do I need to go to something like these http://minisport.com.au/mini-dual-valve-springsa-fast-roada-200lb? Is 200lb excessive for a road motor? Is correct procedure for assemble, choosing correct springs but measuring assembled length in head and shimming to achieve recommended assembled length. My main concerns are to avoid spring crush and I would like to rev to 6500rpm on the odd occasion. All engine components have been dynamically balanced together so I hope it will get there well enough.

Author:	drmini in aust [ Wed Jun 24, 2015 7:27 am ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
RE83 needs good springs due to valve acceleration rate. I'd use C-AEA526 springs, available from Minispares, Karcraft and elsewhere. These are 180lb, which is plenty. They work well with an RE83 cam, both on smallbore and 1275 heads. Pretty cheap to buy, and made from good material.

Author:	sitnlo62 [ Wed Jun 24, 2015 11:33 am ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
drmini in aust wrote: RE83 needs good springs due to valve acceleration rate. I'd use C-AEA526 springs, available from Minispares, Karcraft and elsewhere. These are 180lb, which is plenty. They work well with an RE83 cam, both on smallbore and 1275 heads. Pretty cheap to buy, and made from good material. Kev, At what height, length are these springs "C-AEA526" measuring 180 lb.. Thanks, Dave

Author:	drmini in aust [ Wed Jun 24, 2015 4:43 pm ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
Dave I don't build race engines, so don't have the equipment to check spring rates. These springs were originally rated at 180lb with up to .495" lift, but I see now Minispares are now calling them 200lb with up to .515" lift. I suspect this rating is `over the nose' spring pressure. GR might chime in with more info as he uses them for fast road motors too. I've used 526s on several smallbores, and have had a set on my 1360 now for 10 years. It is still good for near 8000rpm. I find them consistent. And I can buy them here. http://minispares.com/product/Classic/E ... o%20search

Author:	68Rusty [ Fri Jun 26, 2015 1:47 pm ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
Thanks for the feedback and advice, greatly appreciated.

ausmini https://www.ausmini.com/forums/

12G295 head & RE83 Cam - Which valve springs to use https://www.ausmini.com/forums/viewtopic.php?f=2&t=89796	Page 1 of 1

Author:	Chux [ Fri Jun 26, 2015 9:33 pm ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
I refused to read any more of your post after it said you weren't planning to rev it past 6500 Rusty hehehe

Author:	68Rusty [ Sat Jun 27, 2015 7:10 am ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
Chux wrote: I refused to read any more of your post after it said you weren't planning to rev it past 6500 Rusty hehehe I'm trusting the red line on my old Smith's tachometer

Author:	low n blown [ Tue Jun 30, 2015 7:45 am ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
sitnlo62 wrote: drmini in aust wrote: RE83 needs good springs due to valve acceleration rate. I'd use C-AEA526 springs, available from Minispares, Karcraft and elsewhere. These are 180lb, which is plenty. They work well with an RE83 cam, both on smallbore and 1275 heads. Pretty cheap to buy, and made from good material. Kev, At what height, length are these springs "C-AEA526" measuring 180 lb.. Thanks, Dave Perko, I have a spare set here that are new. Will put it on the tester and let you know. Pretty sure when I ran up a set they didn't get anywhere near 200lb. I am thinking they could only produce around 160lb from memory, but will have a look today. There was a lot of variation in the spring pressure in the Minisport ones at full lift, if I recall the variation was around 10lb. Now 10lb may not sound like much but its enough to cause stress. If you guys don't believe me, next time your giving the missus a rev, tell her that by your calculations, at the compressed height you have noticed that her arse has increased by 10lb. Wait short while and then reassess the damage. Kev, you may want to invest in a spring tester.How else would you calculate your installed height. Road engine, race engine they all should be built to the same quality. I have said it before but we should never believe what the retailers tell us. Interestingly enough I recently tested some Isky springs and had 2lb variation across all 8 springs, and a similar variation with a set of NOS Terrys springs. Seems like quality control isn't what it used to be. Not sure I am a big fan of the steep ramp angles. Too much spring needed and as a result too much stress put on the valve train, cam followers (which seem to be suffering amongst people) and consequently the cam lobes for a roady. Have you got something else to use?

Author:	GR [ Tue Jun 30, 2015 6:51 pm ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
Hi low and blown The mini spares AEA526 springs measure 98lb @1.4 and 85lb @1.42 The isky springs that you speak of have a spring rate of 320 lb the 526 have a rate of 300lb. The isky spring was only ever designed for .375 lift at the valve The best thing that happened to the terry springs is that you can not get them any more, the morris 1100s outers and Cooper S inner were a much better combination and still work well to day. The std Cooper S springs run 75lb on the seat with a very mild cam so any sports cam today should be run @ 85/95 lb on the seat (mini's) I laugh at people when the say my road cams are to aggressive and need to much spring when they have no idea what they are talking about I have lot of cams running in motors both here and over seas that don't have any problems as in cam and follower wear providing the followers have been ground correctly. Graham Russell

Author:	low n blown [ Tue Jun 30, 2015 9:42 pm ]
Post subject:	Re: 12G295 head & RE83 Cam - Which valve springs to use
GR wrote: Hi low and blown The mini spares AEA526 springs measure 98lb @1.4 and 85lb @1.42 The isky springs that you speak of have a spring rate of 320 lb the 526 have a rate of 300lb. The isky spring was only ever designed for .375 lift at the valve The best thing that happened to the terry springs is that you can not get them any more, the morris 1100s outers and Cooper S inner were a much better combination and still work well to day. The std Cooper S springs run 75lb on the seat with a very mild cam so any sports cam today should be run @ 85/95 lb on the seat (mini's) I laugh at people when the say my road cams are to aggressive and need to much spring when they have no idea what they are talking about I have lot of cams running in motors both here and over seas that don't have any problems as in cam and follower wear providing the followers have been ground correctly. Graham Russell That didn't take long. I stick by my statements, but we are all entitled to our own opinions.

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