Interesting e30 (m20) stuff

Found this stumbling around looking for erm.... the end of the internet.

http://www.metricmechanic.com/pdf/M20-Engine-Booklet.pdf

I love the "Data from G-Tech Pro"...

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Grant Hughes

Initially looks like some good tips and tricks. Have to read more later.

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heymagic
Initially looks like some good tips and tricks. Have to read more later.

All of their "longer rod means lighter piston and.....less angulation blah blah" is what I've been doing in builds on Saabs and Opels and now Volvos only much bigger gains. Over 500g lighter per hole wakes up those old Volvo tractor engines..

But its for Volvos, who would want to drive an old Volvo....especially when organisers would prefer people to buy new cars.

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John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Of course John we all know you are the absolute shit when it comes to anything and everything.

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heymagic
Of course John we all know you are the absolute shit when it comes to anything and everything.

Hey Gene, what's with this snide bullshit?
You like the BMWs , I don't see the point of a 6 when 4 will do..

All that "interesting" info is nothing new--all discussed to death here and elsewhere for decades..

I just thought it was FUNNY that this place--infamous for insane prices as one expects from a BMW shop---was all excited about saving 150g here-- there ,

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Page 11

The MM “H” Beam Rally Rod is forged out of 4340 Chrome
Moly Steel. It’s length, measured from the center of the small end
to the center of the large end, is 138mm. Weight is 510 grams. The small
end is set up for a 21mm wrist pin that weighs 80 grams.
1
2
3
1
2
3
The Stock M3 or 328i Rod at 135mm long is used in a 3200
Sport Engine. These rods weigh 540 grams to 575 grams.
The Stock 325i M20 Rod is 135mm long and is commonly used
in our MM 2900 Sport Engine. Weight is 640 grams.
The MM “H” Beam Rods can handle twice the horse
-
power of a factory “I” Beam Rod.
The principle load bear
-
ing beam member in the middle has an elongated hour glass profile.
This shape helps focus the pin load and the rod bearing load into the
central beam.
4
MM Stroker M20 Engines Continued ... Rods
Metric Mechanic Development History of the M20 Engine
The MM Rally Engine:
A New Level of High Performance
Wanting to take these engine to a higher level yet, we
introduced the M20 Rally Engine Series focusing on
reducing the weight of the reciprocating mass (pis
-
ton, pin, rod) while adding strength. Key to achiev
-
ing this goal is the “H” Beam Rod which is not only
light at 510 grams but also fortified by nature of it’s
“H” design and it’s material - 4340 chrome moly
(molybdenum) steel. Given the height constraints of
the block, we installed the longest rod we could.
Our “H” beam rods are 138mm long with an
89.6mm crank, 139.75mm long with an 86 crank
and 140.5mm long with an 84mm crank. There are
several advantages to using longer lightweight “H”
Beam Rods in a high RPM engine.
1)
It can’t be over-emphasized, engine reliability is
greatly extended with strong lightweight reciprocat
-
ing parts.
2)
Light rods and pistons allow an engine to rev up
more quickly resulting in faster acceleration.
3)
A shorter lighter piston can be used with a length
-
ened rod. The piston in our Rally Engine is 50
grams lighter than a Sport piston (260 g Rally vs.
310 g Sport). Installing a lighter piston enables
us to use a smaller 21mm piston pin (Sport pins
are 22mm), over 10% lighter (80 g Rally vs. 89.9 g
Sport).
4)
By using a longer rod, the piston dwells longer in
the top dead center area during combustion. This
allows the flame front to more effectively push
against the top of the piston at high RPMs. A short
rod will pull the piston away from the top faster
than the flame front can grow, causing a high RPM
power loss.
5)
A long rod will reduce the thrust angle of the re
-
ciprocating mass into the cylinder wall. This puts
less load on the piston skirt. Also, our “I” beam is
150 grams lighter than the stock 325i rod, further
reducing piston skirt loading to aid in the preven
-
tion of piston collapse.
6)
When using a longer stroke crank, the bottom por
-
tion of the piston skirt will travel out the bottom
of the cylinder. Since this causes a slight rocking
of the piston, it can be perceived as piston slap.
By using a longer rod, the piston
moves up in the cylinder and be
-
comes more stable.
In summary, Rally engines are all about hi-tech
lightweight extremely strong reciprocating compo
-
nents that increase longevity and aid acceleration

when I've been doing that only much much moreso for decades, and what the fuck Gene.

You know it would seem that if you gave a shit about entries and retention of people in the sport, you would be saying nice about somebody making good solid stuff for the ordinary club type folks


RATHER THAN YOUR CONSTANT SHITTING ALL OVER ANYTHING I MAKE AND DO.

YOU are not making any anything to help guys have more reliable engines, more fun engines, better clutches, flywheels, better brakes, better gearing choices, stronger diffs for more reliability, or better suspension that works..

Why criticise constantly somebody who is at least trying?

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John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Quote
john vanlandingham

But its for Volvos, who would want to drive an old Volvo....especially when organisers would prefer people to buy new cars.

Seriously John, grow up. You're the king of snide, lying , mis-represtation, dead horse beating and trolling. Don't act like the world is crapping on your door step and you just don't know why.

You do an amazing job of working with little or nothing to make something. You lack greatly in social skills and the ability to produce parts in an aceptable time frame, some days. You only think your vision is correct and all others are flawed.

So you just keep building your stuff, I'll keep doing what i do. We are on different paths but walking in the same direction ultimately. If you want to replace the very large and generous donation that All Star Ford gives us for the worker banquet then please state so now.

Our sport needs a constant influx of new competitors . You wrongly assume that only poor people are interested and that anyone who makes a large income and can afford more or newer is evil, trustafarian is the word you frequently use when attacking to make people instantly defensive. A nearly new Ford with 6000 miles is not really anymore expensive than a 30 year old VW. Recognize that. There is huge value in driving something 'commercially' modern. New engine, new transmission, new heater motor, new wiring harness, new glass, new window regulators, tons of new parts to be sold off, current parts with value. There is a greatly increased chance of sponsorship. I had parts store, local tavern, Les Schwab Tires and Toyo as well as corporate money from Hamms beer back in the day. A little effort but I rallied pretty much on someone elses dime. My cars were clean, painted, fast enough and not old and neglected. Tain't that hard.

Would I build a new Fiesta? No, not for me. Would I build an old VW? Hell no, really not for me. I would consider a BMW or Mustang. I can easily afford whatever I wanted. The results from rally aren't really tangible and typically reserved for only a small percentage. The real reward is the fun. Going fast, making life long friends, driving a car that appeals to the owner. However 'wrong' and twisted that seems to you.

Rally isn't only your dream and ideals, it is all of us. I spend hundreds of hours a year working on this for the competitor, not for profit. Kieth does similar work. The poorest ralliest around is currently running a large aluminum skid plate I gave him. He also has the loan of my odos. No strings. You quit assuming that someone who wants more or different is a personal rejection of you and the world will be a much better place. You post like a total ass, bully, lie, twist words, bring up old stuff from other forums and generally pound on people you don't like or agree with until they just go silent. That doesn't make you a winner. You're not like that in person, why go out of your way to be such a dick online?

Your formula of old Volvo or Merkurs isn't the only answer. Where is Grant? Where are the other dozen Merkur builds? Where are all the Volvos? (we know Al is still fixing his gravity overdose) but the others? Nada. Look at the entry lists. No big influx of those cars now that they are 30 and 40 years old. Way more Foci and Festers. There is a place for all of them (That place is Olympus btw and the Cascadia Championship).

Balls in your court old friend.

.....



Edited 2 time(s). Last edit at 11/09/2013 11:48PM by NBS2005.