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Moving along on the assembly more recently. Don't have pics from front and rear covers are on, middle-pan is sitting ready to clean again and install with sealant.
If you take your time and do it right, you can really see a difference. And it feels better making the car new again. I don't like old grime on "newly" reconditioned cars.
lol, well if you really want to know. BBC for 2007 Sub 2500, Z06 DD that will get 2650 and e85, and an 89GT (928) will get reconditioned and sold. And all the rest.
But my wife asks me daily "When will you finish my car?" and hers is this e55. Front suspension, rear tank, and transmission refresh after this long block. Oh, and a head unit that is more modern.
Max lift shouldnt have any effect on PTV clearance in this application with as short as the duration is .
The pistons are down in the bore when the valve is at peak lift.
(still, always check with clay!)
Originally Posted by BC928
I have some more pics coming on the progress. Ported the SC a bit. Smoothed the ports and bowls on the heads. Got them resurfaced.
Max lift shouldnt have any effect on PTV clearance in this application with as short as the duration is .
The pistons are down in the bore when the valve is at peak lift.
(still, always check with clay!)
i have not asked. Seems like most don’t wish to share.
That seems so strange to me.
I suppose with a mostly stock engine you can just throw some mystery cams like that on and it’ll probably run, but if you’re building something more custom and elaborate, you need to know the specifics on all the parts you’ve got so you can first crunch the numbers to make sure they’re going to work.
Originally Posted by BC928
i have not asked. Seems like most don’t wish to share.
Last edited by Sir-Boost-a-Lot; 01-10-2020 at 10:42 PM.
I will probably go down and cam doctor the existing stock ones and see where I *should* like to go with lift and duration.
its so limited. It’s not like there is even anyone left or have a conversation with (present company excepted) about what is required and what has worked.
A while back I doctored the stock 55k cams, plus a set of VRE/PTE and Crower custom regrinds that I never got around to using. I might still have the data in my desk drawer. I’ll look this weekend.
Originally Posted by BC928
I will probably go down and cam doctor the existing stock ones and see where I *should* like to go with lift and duration.
its so limited. It’s not like there is even anyone left or have a conversation with (present company excepted) about what is required and what has worked.
A while back I doctored the stock 55k cams, plus a set of VRE/PTE and Crower custom regrinds that I never got around to using. I might still have the data in my desk drawer. I’ll look this weekend.
Heads are picked up and clean for assembly. However, it may be that I need to double check some of the keeper installations. These closeups show that the exhaust valves were tipped a bit. I will be replacing the hydraulic lifters for all valves on the rockers for good measure.
Seat pressure is still higher than anticipated. The valve train is a roller assembly, so not as affected on pressure as flat tappet (Porsche does this and still does).
I could disassemble and shave the spring cups and the bottoms of the springs to buy maybe a millimeter or 2 to step out the springs.
What are are you getting for seat pressure?
And how are you measuring?
Originally Posted by BC928
Seat pressure is still higher than anticipated. The valve train is a roller assembly, so not as affected on pressure as flat tappet (Porsche does this and still does).
I could disassemble and shave the spring cups and the bottoms of the springs to buy maybe a millimeter or 2 to step out the springs.
What are are you getting for seat pressure?
And how are you measuring?
The shop that did the work (new exhaust guides, new valve angles cut, surface head, etc - measured and found 120 closed. I’m thinking maybe they will loosen a bit but not below 110.
I tested these Springs alone with my own tools and pressure tool. At installed height it was more then 90 but not as high as that. Can’t quite remember.
120 lbs of seat pressure, at what installed height?
What year is your car?
I thought all the 55k heads were the same but I could be mistaken. I know the NA heads have longer valves and taller springs so if you’re running those heads you’ve got to shim the seats to run the beehives (or OEM 55k Springs)
it looks like you’re just refreshing the heads that came on your car.
Originally Posted by BC928
The shop that did the work (new exhaust guides, new valve angles cut, surface head, etc - measured and found 120 closed. I’m thinking maybe they will loosen a bit but not below 110.
120 at what installed height?
What year is your car?
I thought all the 55k heads were the same but I could be mistaken. I know the NA heads have longer valves and taller springs so if you’re running those heads you’ve got to shim the seats to run the beehives (or OEM 55k Springs)
it looks like you’re just refreshing the heads that came on your car.
2006. Original e55 heads. If I shim the seats it will be even higher obviously, and these are the K heads. As you mentioned, stock double springs land around 70s closed. These are now 120 closed at the original installed height. I think it’s like 1.47 or something like that.
They mentioned they have the installed heights listed for all engines but I also gave them the 1.47 that I have seen mentioned. I suppose I could look in the WSM to find out if Mercedes mentions it.
There’d be no reason to shim them any further if you’ve already got 120 pounds on the seat.
I wonder if the machine shop might have measured at the wrong installed height?
If you’d like, you can send me a few springs and I’ll check them for you. I’ve got some OEM springs as well as some other brand new beehives that I can do an A-B comparison with.
Originally Posted by BC928
2006. Original e55 heads. If I shim the seats it will be even higher obviously, and these are the K heads. As you mentioned, stock double springs land around 70s closed. These are now 120 closed at the original installed height. I think it’s like 1.47 or something like that.
They mentioned they have the installed heights listed for all engines but I also gave them the 1.47 that I have seen mentioned. I suppose I could look in the WSM to find out if Mercedes mentions it.
12-03-2019, 09:01 PM
