Single valve spring

[smahala1286]

I broke a rocker arm last hpde event and while replacing them I noticed I don't have dual valve springs. All of the intake and exhaust valves only have a single spring. Looking at the real oem diagram it looks like I am suppose to have dual springs can anyone confirm this?

[digger]

what engine?

[smahala1286]

Oh sorry 89 325is

[whodwho]

It should have dual springs, you need to get a set of inner springs.

How many journals are on the cam? Can you see a letter designation like a K or M or anything painted on it?

It maybe a SETA head

[smahala1286]

The cam does have an M painted on it.

[MonkeyMadness]

I had the same thing with my sons head. 885 head everything check out and ran fine. Went to drop in some HD rockers and a 272 cam and noticed his head only had one spring. I want to say his head was a 87 if i remember right???

[SmokeE30]

Could have been a SETA 885, they should be the only 885 heads that came stock with single valve springs, idk of the single outside spring is the same as the dual outside spring but realOEM should have the answer.

[whodwho]

I believe from memory that is a SETA cam. Check how many journals it has, it will have 4 or 7.

[smahala1286]

It has 7 journals

[whodwho]

There is supposedly a 4 and 7 journal version so that isn't real conclusive, search around on the M marking and that may help you conclude.

I bet you will find that it is a SETA, you can find a stock b25 cam or go for a Myster-E one and throw it in there while your at it

[wojtek79]

It should have dual springs, you need to get a set of inner springs.

How many journals are on the cam? Can you see a letter designation like a K or M or anything painted on it?

It maybe a SETA head

What is the difference between the M and the K cam? I have found both in the 885 heads in the past. I have also found the single springs in an early 885 head. There is a special washer under them.

http://www.z367.com/z3/bmfr/885single1.JPG

http://www.z367.com/z3/bmfr/885single3.JPG

[digger]

single M20 spring is different to the outer spring on the double setup. retainer is different to. it is worth upgrading to the double valve springs and associated retainer if the engine sees more revs than a ETA/SETA.

K cam is for low comp (8.8:1) M20B25 with engine code 25 6k-1. not sure what M is dont recall seeing one. Seen an L on a B20 was much same as B25 but advanced a few degrees. There are only minor difference between the stock ones fro the "i" engines i.e. B20/23/25. Certainly not enough differenece to worry about swapping one factory camshaft for another factory one unless you have an ETA cam which is junk

[whodwho]

I looked into this when I working with a SETA head, the outer springs and retainers were the same. I was able to buy a set of inner springs and add to the existing springs. It looks like even the later ETAs ran them as well.

The 'M' cam is a SETA cam, mine was a 4 journal one and there was a 7 journal one. I assume they were the same or very similar profile of the ETA one.

I wanted to run this setup on my supercharged setup for the lower revs so I could setup the SC ratio to bring boost on a little sooner but the old Paxtons didn't like too many RPMs. I had a hard time finding a 7 journal one so I ran with the 4 journal and the dual springs and still running on it and no issues with +6k RPMs. i have a Vortech for it now so that will be a changing :)

spring cups
11340626116 - < 09/1985
11341706609 - 88
11341706609 - 91

outer spring
11341279211 - < 09/1985
11341706583 - 88
11341706583 - 91

inner spring
11341706584 - 91

spring retainers
11341280649 - < 09/1985
11341706626 - 88
11341706626 - 91

cam
11311276441 - < 09/1987
11311720670 - > 09/1987
11311716138 - 91

[smahala1286]

Thanks for all the helps guys. Im tired of putting money into the m20. Time for a 24v swap!

[digger]

I looked into this when I working with a SETA head, the outer springs and retainers were the same. I was able to buy a set of inner springs and add to the existing springs. It looks like even the later ETAs ran them as well.

The 'M' cam is a SETA cam, mine was a 4 journal one and there was a 7 journal one. I assume they were the same or very similar profile of the ETA one.

I wanted to run this setup on my supercharged setup for the lower revs so I could setup the SC ratio to bring boost on a little sooner but the old Paxtons didn't like too many RPMs. I had a hard time finding a 7 journal one so I ran with the 4 journal and the dual springs and still running on it and no issues with +6k RPMs. i have a Vortech for it now so that will be a changing :)

spring cups
11340626116 - < 09/1985
11341706609 - 88
11341706609 - 91

outer spring
11341279211 - < 09/1985
11341706583 - 88
11341706583 - 91

inner spring
11341706584 - 91

spring retainers
11341280649 - < 09/1985
11341706626 - 88
11341706626 - 91

cam
11311276441 - < 09/1987
11311720670 - > 09/1987
11311716138 - 91

those p/n suggest the outer spring is different to the single spring do they not? i know it is on some heads with singles because i have dozens of each in a box when i pulled apart several 200, 731, 885 heads a few years back did not do an eta head though it was e21 323i.