interesting. Custom grind? or a shelf stock part?

 

Cool! What are the cams lift and duration?

 

i noticed the flat metal springs around the rocker arms.....when were those introduced? what do they help do? interesting....

 

So were these a mercedes thing or were they AMG? or something you added Jonathan?

I saw that they help the rocker stay in place but I've never seen those on any engine except for yours.

 

nice work! :thumbsup: :thumbsup: :thumbsup: :thumbsup:

 

On hydraulic lifter cams like our engines, to add these hot cams by themselves could possibly bend the valves if i am not mistaken, JONO would have had to rotate the engine in the normal direction of rotation until the exhaust valve begins to open. At this point, he adjusted the intake valve to ZERO LASH with no pre-load. Then rotated the engine again until the intake valve has fully opened. Then had to adjust the exhaust valve to ZERO LASH, then 1/2 more turn. Repeating this procedure on each one of the 16 lifters until each cylinder is completed had to have bloodied some knuckles.

 

To answer a few questions @ once, yes the grind is custom..sorry not putting my #'s out there

They lifters are actually from an early M117, namely a W108 280SE 4.5.

The clips help hold the rocker arms on the lifter.

Aside from checking the zero lash I also have to set the lash when on the heal of the cam..lot of time and fort. I wear gloves when I do this sort of thing so my hands only bounced off the hard bits..no blood which always makes for a good day!

Hope to fire things up once I finish breakfast over here and go from there

Jonathan

 

I wear gloves when I do this sort of thing so my hands only bounced off the hard bits..no blood...
Jonathan

If there was no blood, you didn't work hard enough at it

Blood sacrifice is required when working on cars.

 

Pleased to report that it works, and seems to work well...at least while sitting in the garage breaking in the cam.. Throttle response has tangibly increased, idle quality has def. decreased.. While in D there is a light lump @ idle as per a street/strip cam in a muscle car. Exhaust has changed tone which I'm assuming is from the increase in overlap resulting in more of the charge being blown out whilst idling..

Changing the oil after the break in so once that's done along w/ checking lash one more time I'll take her out for a spin

Jonathan

 

Awesome!

Leave it to Jonathan to push it to the limit and amaze us all yet again.

Let us know how it goes.

- Steve

 

Jonathan, in case you didn't see it I thought I should mention it in a thread you've authored: please check your e-mail, I sent you a contract a few days ago.

 

Yup..working on the contract to send back.


And thanks Cyber..I'll keep y'all posted


Jonathan

 

To answer a few questions @ once, yes the grind is custom..sorry not putting my #'s out there

They lifters are actually from an early M117, namely a W108 280SE 4.5.

The clips help hold the rocker arms on the lifter.

Aside from checking the zero lash I also have to set the lash when on the heal of the cam..lot of time and fort. I wear gloves when I do this sort of thing so my hands only bounced off the hard bits..no blood which always makes for a good day!

Hope to fire things up once I finish breakfast over here and go from there

Jonathan

So if this goes well Jono, are you going to be offering a custom cam conversion? What about for Euro's? What kinda performance improvements are you guessing this will yeild?

Greg

 

jon....I know you were talking about making them available when I talked to you before...I'd be interested in a pair when you get all the bugs worked out.

 

Awesome, just awesome

Nice to see a technical mod of this nature done instead of usual "Look, I got a new steering wheel" or "Look at my new hi-performance Brabus wiper blades" kind of thread

 

Jono - Have the springs been uprated as well ?

Not a neccesity, but ideal.

Looks good ! Sounds Good.....no doubt it will go as well as it looks and sounds !

have you done dyno runs before the install....to compare with post install ?

cheers
t

 

Thanks Nomada!

Talbir, that's one of the things I'm going to check and see if I need whist on the dyno...if the HP signs off Hard I know I'm hitting valve float. If I don't need extra spring seat pressure that would be ideal, should some be in order I can start w/ the factory shims @ 1.5mm

Here is the dyno run w/ the AMG spec cams:
Blue Ridge MB and AMG East » Special Projects

Jonathan

 

Thanks Nomada!

Talbir, that's one of the things I'm going to check and see if I need whist on the dyno...if the HP signs off Hard I know I'm hitting valve float. If I don't need extra spring seat pressure that would be ideal, should some be in order I can start w/ the factory shims @ 1.5mm

Here is the dyno run w/ the AMG spec cams:
Blue Ridge MB and AMG East » Special Projects

Jonathan

Wow!

250 HP at the rear wheels and 297 ft/lbs of torque.

....not a bad place to start.

 

Wow Jonathan, that's an aggressive grind when you can see the difference in angle in a picture! damn! Can't wait to hear it! you are going to record soon, right?

 

Thanks Axel and Eddie!

I drove the car this afternoon and from my seat it Sure feels like it starts to come on by 3500 and by 4K the tach is getting all kinds of excited.

I'm looking forward to running @ the dyno tomorrow. I'll take video etc, etc..

A few things I have noticed, I am making a bit less vacuum @ idle (as is evidenced by the econ gauge about 1/8 off the base where it would normally sit) idle is not quite what it used to be but I expected that. Power feels a tough softer bellow 2500-3000 but that was also as I figured it would be.

Anywho, if tomorrow goes smoothly I'll be able to hit the dyno in the evening

Jonathan

 

This mechanical lifter conversion and cams were installed on a pair stock 560 heads correct?

 

whoa....was that dyno from a US spec motor?

 

Cool! What are the cams lift and duration?

Really off topic.


But i am extremely jealous of you that you have an E24, an E31 and an E30.

 

whoa....was that dyno from a US spec motor?

Not exactly... it has 10-1's, tri Y's, AMG cat/exhaust, AMG cams..

Jonathan

 

now I just need to get a 5.6l engine, 10-1 pistons and AMG cams!!!!!

 

Well, the AMG cams are sitting in a box now;-)

My other (hydraulic) grind is a Touch warmer then the AMG spec bits..


Jonathan

 

Dyno re-scheduled for tomorrow @ 7...they were slammed tonight so I didn't feel like waiting till 11 pm to run.

Drove her around some more today and I find I enjoy leaning on the peddle even more then usual;-)

Jonathan

 

dyno rescheduled!?! how DARE you keep me in suspense! haha..

and congrats on getting it to run. i sortta figured you were back-dating to an early variant for the mechanical lifters. it takes a real pioneer to invest the time and money into finding out what is compatible to our motors. i'm very interested in videos of the run and the idle. sounds like it's livelable, at least, right? probably well worth the power regradless..