The Cal-look Lounge

With al the tricks in the books,shuffle pins , steelplates, you name it,- whats the highest number, and survived for more than just a few runs down the strip?

About 450 hp

450 only for some runs down the 1/4 mile.    But if you have a good crank and  NA engine up to 230 or 250 hp it works for many years for strip and street cruising without steel plates . I like it more than alu cases. Right now I change from alu to mag on an ss engine , and i have a 280 hp for Strip only for 5 years now

I use an AS41 OEM mag case with no shuffle pins or plates in my 2332 cc engine.
700 trips down the drag strip, with 8000 rpm rev limiter.
Still using the same main bearings after 59,200 km of mostly city driving, plus the 1/4-mile racing.
204 WHP, so probably 225 HP at the flywheel.
Broke one Scat chromoly head stud this year at the track, the rest has been little valve train issues (broken adjuster, lash cap & bent thin-walled pushrod).  Choosing good quality valve train parts in important, but he case itself seems very durable.

Apart from the intended agenda for a motor, Temperature and age are the killer of mag cases, material embrittlement comes from both, just one good overheat cycle is enough even on a newish mag case. Endurance circuit race and Rallycross engines can be built to survive at very high hp and torque but need a steel plate girdle both to pin the head studs into a decent anchor and to stop the case ballooning with through bolting. Such motors typically logged around one or two hours over a weekend event as reliably as a race engine can be expected to be.  We have a turbo rallycross motor in the uk running 650 hp but it's moved on from a spec similar to above but has moved over to a Scat ally case and flanged crank to survive race weekends, even this has some steel plate armour,  the weal link now for it is Transmission and drive shaft problems.

Probably more like 240hp at the flywheel. You're making good power!

350 - 400 hp for the last 5 years. No issues at all. Street and race driving. But.. and that is a big BUT.. I do not use all 350 - 400 all the time. Just when my right foot order it  :)

And I service the engine every winter. Check leak, check end play, change valve springs and re-torque the head studs.

-BB-

I built a 90 X 94 in a mag. case super flows for a sand drag team in Mexico that was class champion.  I would imagine it was putting out 300-350 HP.   They would send the motor back every year for about 6-7 years to freshen up with no issues.  The mag. case is pretty strong.

The CSP Ghia has 500 hp with a stock mag case.

 :D :D

Well, stock... It was a mag case at least. :)
There is some modifications to it!
I was at JPM when they dynoed it years ago with Peter Köhmann and Hamster.

But it does not work long...that is too much

Udo

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I would say that with this type of modification, the case is in a totally different category.
"Rock solid" !!!

Firts time I saw it was in the mid 70´s in Swedish rallycross.
My engine was modified 1985 and is still alive after many different developments, racing, street use as Daily driver, long trips etc.

[quote author=Frallan

I would say that with this type of modification, the case is in a totally different category.
"Rock solid" !!!

Firts time I saw it was in the mid 70´s in Swedish rallycross.
My engine was modified 1985 and is still alive after many different developments, racing, street use as Daily driver, long trips etc.
[/quote]

THE engineers solution for a built mag case for racing..

THE engineers solution for a built mag case for racing..
[/quote]

The swedish Rallycross engine builders even tried using a steel section in the case at the middle main bearing !!
I don't recall if it worked or not.

/Rolf

It worked! Now if it helped, I do not know.
I will see if I can find a picture of the T1 with double Saab 4 valve cylinder heads on top. This engien had that modification. Like a huge pacemaker cover on top of the Engine case.

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Look!  Even better!  The "original" Karl Erik Nilsson BDA Engine.
He did it all by himself.
Rods, crank, and casting of the housings for the Twin cam heads......in 1975 he did his first BDA mod. Probably same Engine.
So how much can it stand, the mag case? Years and years of very high hp abuse, if modified correctly and not letting it knock too much.

And how would that have sounded.

Was it na or turbo ??

Gr henri

NA as I saw and Heard him in the 70´s. I have written it many times. 10 000rpm beetle around the Svampabanan track! Lovely!
Then it was turbo. Never saw it at that time. Busy with my own drag strip adventures.

Must have sounded lovely 👍 But with prices on BDA parts these days ,that will never happen again 😳

It still happens but with todays tech, Paul and James Harrolds turbo rallycross car uses subaru heads and runs reliably at 650 fwhp, tho finding a transmission to take it has been expensive, and as Frallan said so correctly, back in the day det control was primative, today Pauls car runs a MOTEC ecu for total control, my own RX car back in the '80's used turbo wasser boxer power and 4WD, the motor runs strong on track still today but minus the turbo, so things never realy stand still for long...