BALDYMAG
77 posts
Joined: 24/10/2004 10:49:55
Location: Uckfield United Kingdom (Excluding channel Islands)
Camshaft removal
if you have a 998cc engine you will find there is two black plates called tappet chest covers on the back of the engine very similar in size to a music cassette box, each cover is held on with one bolt.Remove the covers to gain access to the cam followers, . the push rods will need removing to remove the followers. The rad and timing chain cover will be some of the parts that will need to be removed when taking a cam out of a 998 with the engine in situ. I think there is something about removing 998 cams in the latest Mini mags, but cant remember which mag. If you have not got one buy a haynes manual, they are full of info. I have a 998cc A+ engine on my bench at work, it has tappet chest covers. If a block has the tappet chest covers it makes cam changes easier.. My Mk 1 is fitted with a 1275cc MG metro A+ it has no tappet chest covers.
Posted: Feb 06, 2005 08:22 PM
Andres
2 posts
Joined: 18/03/2005 01:54:34
Location: Santiago Chile
camshaft AEG510
I have desire to buy camshaft AEG 510, for a 1275 +.20 engine. http://www.minispares.com/Product.aspx?pid=35629 But I cant find the corresponding oil pump, or I am not sure that pump to buy, of which they are on the website. May be a OIL PUMP PIN DRIVE MINI (Part No. GLP142) ??? My Cilinder head is ready, 35/29
Posted: Mar 18, 2005 04:19 AM
68Moke
33 posts
Joined: 10/09/2004 21:06:12
Location: Lakeville United States
This cam is a pin drive so you are correct it would be GLP142. I believe you also have a choice of C-AEG410. You may want to e-mail MiniSpare to make a final inquiry. info@minispares.com
Posted: Mar 21, 2005 01:53 PM
danshrl
3 posts
Joined: 15/01/2006 20:08:22
Location: slough United Kingdom (Excluding channel Islands)
STR930 Camshaft
Hi can anyone help i have stripped a 1380 engine and found a STR930 camshaft fitted cam anyone give me any info on this camshaft ie how good is it powerbands etc many thanks
Posted: Jan 15, 2006 10:20 PM
scoobyman
1 posts
Joined: 21/10/2005 16:10:32
Location: United Kingdom (Excluding channel Islands)
Hi I,am sure this is a full race camshaft used in mini miglias.
Posted: Jan 15, 2006 11:20 PM
Haynes
Joined: 18/01/2006 13:05:43
Location: Uruguay
It is a full race cam, basically a 649 and you wont get much go below3000rpm. Apprently it can be quite harsh on the valve train.
Posted: Jan 18, 2006 01:15 PM
Chris
332 posts
Joined: 04/05/2006 21:28:31
Location: Mid Calder United Kingdom (Excluding channel Islands)
1275 automatic camshaft, is it a cooper ?
Having read from a couple of places a hint that the 1275 mayfair automatic had a cam similar to a Cooper I wthought it best to ask this question here where there's a greater chance of getting the facts.
If it is true, where can I find the timing spec for it in order to compare it with an MG Metro cam for when I have to decide which one to fit to the next engine ?
Posted: May 17, 2006 09:13 AM
John
1948 posts
Joined: 28/05/2006 16:49:46
Location: cambridge United Kingdom (Excluding channel Islands)
i dont know about profiles of auto cams but i do kno they use a differnt oil pump drive shocket as the auto oil pump is differnt due to the torque converter, so u cant fit it to other engines. and if ur trying to fit a modifyied cam to a auto box i think u will find it may affect the gear changes unless it is a very mild cam
Posted: May 28, 2006 06:39 PM
Thanks, it confirms what I thought.
I've done the searching around and found from the original parts lists the automatic camshaft has a different part number to the manual but it isn't the same part number as any of the 'performance' cams made as standard.
Didn't know about the oil pump but it makes good sense...
I suppose I was going to wait till i strip the engine completely to see if there were any definitive markings on the cam. I'm stripping it down for it's 9.4CR pistons to replace my 10.5CR pistons in an MG Metro engine - I think I'll be using lots of cheap unleaded in the future !
You're right about fitting a different cam into an automatic engine, if it could be done, it just wouldn't pull past the torque convertor let's it and change up too soon, so plenty of other mods would probably be need to the autobox first.
Posted: May 28, 2006 09:41 PM
why u lowering your compression 10:1 should be ok on normal grade unleaded fuel. if u lower ur compression ur just going to loose power and economy
Posted: May 28, 2006 09:58 PM
The compression at the moment is 10.5:1. I know of someone who had preignition problems and attributed it to their 10.5:1 compression ratio. We both have the same early MG Metro engines from 85/86 when unleaded fuel wasn't compulsory, I didn't get to look into it myself unfortunately.
it would be nice to hear from anyone running 10.5:1 compressions to see , especially if they have tuned the engine too. I know it would be a shame, I suppose I need to find out the facts now. I had planned to use the standard BVH 12G940 but it isn't unleaded, and although I have a couple of bottles of lead substitute I think it makes more sense to modify the unleaded 12g940 which came with the automatic 1275 for added future-proofing
Posted: May 28, 2006 10:13 PM
yeah i think its between 10:1 and 11:1 when it starts pinking or knocking on standard grade fuel without retarding ignition. uv gotta be careful with those lead replacement additives iv read alot about them and most can cause alot of problems u can get away with using them on a head that has been used on lead for along time but once the lead memory/ deposits wear off then even with most additives the valves will start to reseed. two products however are ment to be up to standard redline lead substitute and superblend zero lead 2000. no other lead replacement products passed the new tests. do u know how much its going to cost to have valve seats done? if u got head chamber enlarged slightly by meashening in right places like perfomance onces are then u could probley increase capasity enouth to get the compression ratio bellow 10:1 and not have cost of complet engine rebuild. also thicker cooper gasget would help if there avalible. unless engine could do with rebore of course.
Posted: May 28, 2006 10:59 PM
yeah found u can get combustion chamber from 21.4cc to about 25cc
Posted: May 28, 2006 11:04 PM
do u know how much its going to cost to have valve seats done? if u got head chamber enlarged slightly by meashening in right places like perfomance onces are then u could probley increase capasity enouth to get the compression ratio bellow 10:1 and not have cost of complet engine rebuild. also thicker cooper gasget would help if there avalible. unless engine could do with rebore of course.
I've been quoted about £25 aprox for each valve seat. To be honest I can't justify that ammount when I have another head which is nearly as good and with unleaded seats already fitted.
But yes, you have pointed out somerelevant information there. I am going to be cutting the head and so the 10.5 CR will naturally come down as a result. There'll be a bit more metal between the valves too using standard sizes so hopefully less chance of cracks.
Posted: May 29, 2006 12:23 AM
so u fitting an mg metro engine to ur mini? i know mg metro has gd cam profile and better intake manifold.
Posted: May 29, 2006 10:45 AM
Yes , it's been lying in the garage for too long.
I was going to rebuild a smoking 998 A+ with new rings, and fit the MG metro cam and a 12G295 head to it. The problem is that now I've stripped it down it seems the gearbox bearings are almost about to give way.
So I have a 998A+ and the 1275 MG Metro, both needing piston rings and both needing gearbox bearings. So I'm opting for the MG Metro engine. It also has a close ratio box which although might be nice for the 998, the 12g295 for the 998 doesn't have unleaded exhaust valve seats.
The MG Metro 12G940 head has a larger intake valve than the standard 12G940 which I would love to use but if it's not unleaded I can't use it. I expect the car to be either sold on or at least used by someone else, and it's not the normal thing to remember to put in lead substitute every fill-up, so unless I keep it for myself it could become unreliable very quickly.
I reckon I can get the car finished for another £200 from here, but it's hard to come by.......
Posted: May 29, 2006 11:00 AM
u shud put 12g295 head on ebay they make 50+ on ebay would help pay for project just lable it as 998 cooper / mg 1100 head as with the right compression ratio that head will increase power of even an 850 engine by 6-7bhp because design is so much better
Posted: May 29, 2006 11:14 AM
one other thing just incase u didnt know the metro has differnt oil pump drive again to the mini i think
Posted: May 29, 2006 11:15 AM
C. Barron
Yes, I've got that in mind...it's been skimmed aprox 60 thou and is in good condition ...it brought my wife's old 998 to life a couple of years ago. But hasn't been used since.
Posted: May 29, 2006 11:20 AM