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The Most Aggressive Camshaft For The Street?


opprimer
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Hallo guys.

I have a 1970 BMW 2002 that i bought last year: http://www.bilgalleri.dk/galleri/271545-bmw_2002

The engine thats in the car was build for race and i cant remember all the details about the engine but it was build as a very serious raceengine and i know that it produced just around 170hp.
I know that especially the head wich comes from a 316 has been going trough a lot of very very expensive work and it has a 316 Shrick camshaft.

 

The "problem" is that the guy that build the engine isnt the same as the one who build and restored the car. The guy that restored the car bought the engine from the other guy, but he shouldnt use it for racing and the head with the 316 camshaft was therefor way to agressive for him. He therefor took a completely original Ti cylinderhead with a original cranckshaft and installed that in the car.
 

The car now produces 146 hp at the engine and 126 at the wheels.

 

My question is:
I am not using this car as daily driver AT ALL. I only drive it for fun when the weather is good in the summer and i have therefor been thinking about installing the other cylinderhead again some dag, but i dont know if it really is to agressive for the road, even though the car is only for fun? 

The reason why i mabye want to install the other cylinderhead is because i think it is quite a shame that so many $$$ and so much time is just being "wasted" when it just lays there on the floor in my garage and at the same time the engine in the car that actually is a hardcore raceengine kind of deserves better than a stock Ti head. :-)

 

 

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Surely 316 can be driven on streets but is it fun is another question. Depends a lot about you. Normally Schrick 304 is the max recommended for street use. Think a little how much you can use the power at very high rpms?

 

Since you have the other head it's not so big thing to try it. It may be very much fun for some time and then you could go back if you start to feel like it. Also one option would be getting a 304 cam to the hipo head...but I couldn't resist trying the 316 first. :)

 

  Tommy

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Ive been a passinger in a rally car with that spec. It was far mor civilised at lower speeds than I thought with a reasonable amount of bottom end but was still a pain in the arse in stop go traffic. On the other hand it only really started to come alive at about 5k and the whole tone of the engine changed as the overlap and ignition timing came on stream. Also it was very noisy and started to give me a headache after a few mins. It did sound glorious when on the cam, but do you really want a road car that you have to have it at 5k + to be in the sweet zone. Id tend to sell the head and buy suspension upgrades or a LSD. Is the current engine on 45s?

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Frederick--so how is it running? Are you still using the dual 45 carbs it came with? They may be too big for a stock cam, though perhaps small venturi's and re-jetting might work.

 

I recall our previous discussion ended up with suggestions for a 304° cam:

http://www.bmw2002faq.com/topic/146686-how-much-hp-from-my-bmw-2002/

 

The thing is, the extra head you have must be used with the 316° cam in it, or an even more aggressive 328° or 336°, as all three of those Schrick cams have an enlarged first and second cam journals. So the head you have has been line-bored for the bigger journals, and you cannot install a 304° or smaller cam, unless you had one custom made with larger journals (maybe there is one out there that will fit, I am just not aware of it).

 

So, if you want to use that head you will be back to the full race engine. If the car is only for fun driving I think that would be fine--just realize the power band is from about 5000 RPM to 7500 RPM or so. But since it makes good power it will pull from lower RPM, you just don't want to be in stop-and-go traffic. This is an "open road" engine :)

 

EDIT: good point about the noise at high RPM. My 316° track car, described in the post linked above, has a 3" exhaust through a Magnaflow 18" x 6" muffler. I thought that would be enough, but I've taken to wearing earplugs as it is loud at sustained high RPMs. I love the sound though, that sucker barks (180 RWHP, roughly 215 crank HP). Still don't have the AFR dialed in, though.

 

Best, Fredric

Edited by FB73tii
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"...So the head you have has been line-bored for the bigger journals, and you cannot install a 304° or smaller cam, unless you had one custom made with larger journals (maybe there is one out there that will fit, I am just not aware of it)."

 

 

That's true. I wasn't thinking far enough.

 

  Tommy

 


Edited by Tommy
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I run a lightweight flywheel with a 292 every single day in NYC traffic. With a 3.9 diff I have absolutely no trouble whatsoever since first gear is so low that I never have to lug the engine. Really though it's all in the Megajolt Ignition. Electronic ignition makes an unbelievable difference low down. EFI would be ideal for the most overall power and smoothness, and honestly I think that a bigger cam is absolutely doable, especially if you mainly drive outside of a crowded city. 

 

Get the ignition set properly and you'll have an engine with a wide powerband and just enough power down low to be driveable around town. when you have the space for fun you wind it up through the powerband and enjoy that glorious noise. 

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