Cylinder head interchangeability/flywheel lightining

[kdanie]

Will 1.7L heads fit on 1.8L cylinders?
If I wanted to lighten a flywheel, where is it safe to remove metal? I know the most effective would be the thick part on the OD near the starter ring teeth. Any info is greatly appreciated.

[Dave at Pelican Parts]

No, they will not fit.

Yes, that is where you want to remove the material.

--DD

[Jake Raby]

Yep the 1.7 is NOT interchangeable with a 1.8 or 2.0...The head CAN BE opened up for the larger bore, Grab some 1.8's they are my favorite heads...

As for the flywheel, don't go too crazy, or you will lose the streetability aspect of the car..A 914 with a light flywheel is a blast to drive, but it takes alot of getting used to....

[Dale L Jensen]

I dont know where you live but I would use the BEST machine shop you can find for lightining your flywheel this is a faily importiatn step

[TimW]

Hey Jake, can expound on what you mean by lose streetability, blast to drive, and …getting used to?

Or email if the discussion is better left outside the BBS.

Tim
’73 914 2.0L Signal Orange

[Dave at Pelican Parts]

Here, please, if you don't mind sharing! I'd love to hear from people with experience on this subject. Also some views on how much to lighten for what purposes.

--DD

[Jake Raby]

With the gear ratios in a 914, the lightning can make the engine lose rotational
mass, thus making for higher revving starts in first gear.

Also in street traffic and between gear shifts the engine loses alot of pull a,d revs up and down erratically...

The getting used to is basically keeping a foot on the throttle between shifts and using some extra clutch in first...

The acceleration is added, that is for sure, but the difference in lost streetability and lost fuel economy keeps most of my engines outfitted with stock weights..

[jabb]

Lighten flywheel cause the engine to spool up faster. So you will be approaching Redline quicker. The mass of the flywheel
also keeps the engine spinning at idle or low RPM's . To light a flywheel will lead
to stalling problems at idel. Also may require higher RPM's to make that intial start. Just watch how light you make it..

Joe A

[TimW]

I suppose what you end up with then is more horsepower, well torque actually, okay, a little of both, because the engine doesn’t have as much mass to turn right?

[Bleyseng]

When I rebuilt my 2.0L motor, I installed a counterweighted crank. On the advice of my engine rebuilder, I lightened the flywheel to 12lbs to offset the added weight of the crank. I can't say that I have to rev it up at all to start off in first gear. I think it behaves just like before other than it does spool up faster. Hmm, and it rev's higher easier too, but that could be the porting also. I like the way it drives alot but also I don't slam shift either.
Geoff

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76 914 2.0L

[JP Noonan]

Putting 1.7L heads on is a bad idea becuase of the metioned machine work and the fact that the stock 1.7L valves are smaller than the 1.8L valves. OTTOMH 39.3mm vs. 41mm

[pbanders]

please ignore

[This message has been edited by pbanders (edited 04-23-2001).]