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Shrick 284/280 Cam in M30B35

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Rick Eickhoff
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Shrick 284/280 Cam in M30B35

Post by Rick Eickhoff » Tue Jul 14, 2020 7:23 pm

Need some advice from those who have had some modifications done to their M30B35.
Looking to put a little more pep in the Engine.

1988-635csi - 5 speed Getrag 260/6 - 3.91 LSD
86,000 miles
SuperSprint Exaust (Headers, X-pipe, no cat, resonated mid and rear exaust)
EAT - Performance Chip with in e34 - DME 0 261 200 179

Going to pull the head off - give her a new head gasket

Hence I am thinking about while the head is off putting in a new Shrick 284/280 cam - Valve Springs and Seals.

Question: is there a significant difference between the stock M30B35 Cam and the Shrick cam?
Any thoughts on porting the cylinder head ?

Looking for guidance and wisdom from those who have gone down this road. No need to reinvent the wheel.

If stock HP is 211 for the US Spec, may have picked up 15-20 HP with the header, cat-less exhaust and, DME and performance chip.
Hence, I am guessing I''m around 230 HP in its current configuration.

Really appreciate your input.

At 55 yrs - my SCCA Pro Racing days are over, not looking to track this car. Just a fun car to cruise around in, with my Cars and Coffee buddies.

Thanks

Rick Eickhoff
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Re: Shrick 284/280 Cam in M30B35

Post by bpoliakoff » Tue Jul 14, 2020 10:11 pm

Definitely porting and port matching The 284 is a good bit over stock but nice and streetable I have a 284 Schneider cam in my M90 motor amongst other mods and am an older guy so no street racing for me, but the lope at idle makes me feel young again
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
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Re: Shrick 284/280 Cam in M30B35

Post by jps635 » Wed Jul 15, 2020 10:05 am

See attached (n0t mine) which gives some guidelines on what to expect with varying levels of modification and relative investment.

I have a modified Euro B34 doing 214 at the wheels on a dyno dynamics rolling road (250-260 at fly)
- 10.6:1 comp
- 284 schrick cam, schrick springs, titanium retainers, Korman rockers and rocker locks
- head ported and polished
- Pauter rods
- fully balanced
- headers and custom intake
- Link Extreme ECU with wasted spark setup

If you pull the head you'll likely get it skimmed which will bump the compression slightly, so get an adjustable timing gear to compensate.
I replaced my head with a new one (old one had unknown nasty craters in it so be prepared for this) so didn't need planing but block was decked. Given the extra cam lift engine builder put some shallow fly cuts in the pistons to ensure sufficient valve clearance.
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High Power M30.pdf
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Rick Eickhoff
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Re: Shrick 284/280 Cam in M30B35

Post by Rick Eickhoff » Wed Jul 15, 2020 3:00 pm

Excellent article - thanks for passing it along.
Will look at some of the options in group 1 and 2.
My goal is to be around 240-250 HP.

You have provided some great info and food for thought.

Thanks,

Rick
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Re: Shrick 284/280 Cam in M30B35

Post by bakemono » Wed Jul 15, 2020 3:28 pm

The Shrick compared to the B35 is essentially the same duration but more lift, according to this chart (attachment)

On its own, should be worth a modest boost in the midrange.
Attachments
m30cams.gif
m30cams.gif (40.01 KiB) Viewed 692 times
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Re: Shrick 284/280 Cam in M30B35

Post by Rick Eickhoff » Thu Jul 16, 2020 1:42 pm

Good stuff !

So it looks like the Shrick 284/280 cam is the way to go along with increasing the compression from 9.5 to 10.2.

How much can I safely deck the head to increase compression.

Any thoughts on the thin compressed head gaskets.

Keeping in mind this is just a street engine that may due just a few laps around the track for fun now and then.

Really appreciate everyone’s feedback.

Thanks

Rick Eickhoff
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1988 635csi

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Re: Shrick 284/280 Cam in M30B35

Post by 86_6series » Thu Jul 16, 2020 4:12 pm

My build starting with 86 M30-B34 US.
Hartge B-35 head with 294 cam.
Custom JE pistons from 8:1 to 10:1 CR.
B-35 Intake, #100 lb injectors.
Hi volume FP.
Stock B-34 bottom.
Headers no cats custom exhaust.
Haltech stand alone.

210 BHP

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Re: Shrick 284/280 Cam in M30B35

Post by bpoliakoff » Thu Jul 16, 2020 5:07 pm

There are casting markings on the front lower edge of the head indicating the most the head can be skimmed to.I think you need an engine builder in the mix other than yourself. Let him figure it out as there are too many variables at play here and you are all over the board i.e. valve interference with piston tops if head milled too much which should be figured into play when new hi comp pistons are used and brought into play etc etc etc
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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Re: Shrick 284/280 Cam in M30B35

Post by bakemono » Fri Jul 17, 2020 3:51 pm

Sadly, you can't gain all that much compression just by shaving the head. Shaving it .010" only gets you about one tenth of a point. I wouldn't try shaving it .020" without measuring piston-to-valve clearance first.
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'83 633CSi - Megasquirt and a 3.46LSD

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Re: Shrick 284/280 Cam in M30B35

Post by Rick Eickhoff » Fri Jul 17, 2020 5:34 pm

Good Point... Will probably need to go with some different pistons, get the compression up to 10:1.
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Re: Shrick 284/280 Cam in M30B35

Post by bpoliakoff » Fri Jul 17, 2020 7:23 pm

It's still not a matter of different pistons They have to be made so the valves do not hit the piston tops putting an engine together that is not stock is not a matter of throwing parts at it. It is an "exact science" Everything has to work in conjunction with everything else. If you want 240-250HP have an engine builder do it, at least the machining and parts ordering if you want to assemble it yourself. You are probably looking at a minimum of $3500 for a shop to do the pistons, head work and rotating assembly not including a new oil pump and cam timing chains etc That's Phoenix prices and I am sure your labor costs in Philly are a lot higher
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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Re: Shrick 284/280 Cam in M30B35

Post by bakemono » Sat Jul 18, 2020 5:16 pm

New pistons is a can of worms, as you need to disassemble the whole block and re-hone the cylinder bores at the least. However I'm sure there are vendors offering high-comp pistons specifically for a B35 with valve reliefs already taken into account.
'82 528e - M50B25 + GS6-37BZ
'83 633CSi - Megasquirt and a 3.46LSD

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Re: Shrick 284/280 Cam in M30B35

Post by 86_6series » Sun Jul 19, 2020 12:02 pm

+1 on what Bert says.
I was going to build my engine, I wanted to experience the first time challenge.
Bert convinced me to have a pro do it. I'm glad I listened to him.
There are so many little tricks they do that make the difference.

You'll probable have to think about a stand alone if your current ecu can't manage the
more powerful engine. Anti-knock sensors, batch to single injectors, exhaust wave
tuning, fp volume, injector volume all this makes the difference of a rebuild or a screamer.

Just saying that if I would have known all this expense ($22,000)
before I started I would not have done it. I had fun with the 182 hp and 5 speed
on track days. However, this friggin' 6 with only 210 @ the wheels is a screamer.

There were tuning issues that the pros solved, I would have never solved.
You read posts of the horror stories some guys have when the give it their
first start and the shit hits the fan.

Haven't had it @ the track yet. Sept. date @ LRP.
We'll see if the thrill will be worth the $.

Bakemomo is right, wound up being a can of worms to the finished product and costly to come out right.

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Re: Shrick 284/280 Cam in M30B35

Post by bpoliakoff » Sun Jul 19, 2020 6:50 pm

I spoke with him yesterday He has a B35 motor. According to him the pistons are stamped 9.5. So the most probable direction is a head skim a good port and polish job, cam and a normal rebuild with balancing plus an oversize throttle, body which I told him where to look for, and a 2" exhaust system He already has a D'Silva chip which he may have to have upgraded to compensate for the mods. That should get him at least 235-245 hp with minimum amount of money He is a past muscle car guy and has built many engines and does know what he is doing
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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Re: Shrick 284/280 Cam in M30B35

Post by GazM3 » Mon Jul 20, 2020 8:00 am

To gain compression you can also use a thin 027thou mls gasket. I guess piston to valve clearance can be an issue. Perhaps cut in some valve reliefs in your pistons. I had this done in my m10 in my 2002. Got compression from 8.9:1
To 10:1 by skimming head, valve reliefs and 027 Mls. Valve reliefs were done with an old head used as jig cut into 1 piston size and a cutting tool in place of the valve.
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Re: Shrick 284/280 Cam in M30B35

Post by Rick Eickhoff » Thu Jul 23, 2020 5:57 pm

Really appreciate everyone's input. Wealth on knowledge here on Bigcoupe.com.

Thanks,

Rick
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1988 635csi

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