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Difference between 914 and t1 crank?
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Mr Maz
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PostPosted: Tue Jun 12, 2007 12:25 pm    Post subject: Difference between 914 and t1 crank? Reply with quote

Can anyone tell me the difference between a 914 crank and rods and a vw type 1 crank and rods
can they be interchanged??
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glutamodo Premium Member
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PostPosted: Tue Jun 12, 2007 12:58 pm    Post subject: Reply with quote

The 914 used the Type 4 engine. The 66mm and 71mm stroke crankshafts used in those were for designed specifically for that Type 4/Porsche block and are not compatible with the Type 1/2/3 engines.
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lane weinberg
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PostPosted: Sat Aug 11, 2007 1:10 pm    Post subject: other cranks??? Reply with quote

what cases can go with what cranks? 356/912 in a type 4?
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Glenn Premium Member
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PostPosted: Sat Aug 11, 2007 1:41 pm    Post subject: Reply with quote

It's like trying to put Chevy big block crank and rods in a small block.
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DirtyCossack
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PostPosted: Thu Aug 28, 2014 12:59 pm    Post subject: Reply with quote

So is the 914 and Type 4 crank and rods the same? I've read that 914s have different pistons and heads than the buses, but what about crankshaft and rods?
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Bleyseng
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PostPosted: Fri Aug 29, 2014 12:10 am    Post subject: Reply with quote

The crankshafts are the same as are the rods. All the engines were built on the VW engine assembly line but the 2.0 914 engines were built in a batch due to their different parts i.e. heads, rods, crank. This was because the 2.0L started out as only a 914 engine (039 part numbers) but VW started using the 2.0l in a bus in 76 the last year of the 914.
Type 4 cranks are bigger than the type 1 ones and won't fit in a type 1 case.
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Wolfgangdieter
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PostPosted: Fri Aug 29, 2014 8:27 am    Post subject: Reply with quote

"So is the 914 and Type 4 crank and rods the same?"

All are called T4 (Type 4) engines since all made by VW. It's details/specs that were different. So basically a T4 from a VW 411, 412, Transporter and 914 are same. Details like cams, compression ratio, exhaust manifolds, tins, oil filler, etc are different. In a bus you'd want low compression for hauling a heavy, non-aerodynamic box around while in a 914 you'd want higher compression for a light car.
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raygreenwood
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PostPosted: Fri Aug 29, 2014 8:19 pm    Post subject: Reply with quote

Wolfgangdieter wrote:
"So is the 914 and Type 4 crank and rods the same?"

All are called T4 (Type 4) engines since all made by VW. It's details/specs that were different. So basically a T4 from a VW 411, 412, Transporter and 914 are same. Details like cams, compression ratio, exhaust manifolds, tins, oil filler, etc are different. In a bus you'd want low compression for hauling a heavy, non-aerodynamic box around while in a 914 you'd want higher compression for a light car.


All true....but really they are called type 4 engines because they originally came in type 4 vehicles in 1968-74. They came in 914's and busse later. Ray
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DirtyCossack
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PostPosted: Sat Aug 30, 2014 7:54 pm    Post subject: Reply with quote

So if you had a 914 with a 1.7L and needed a new crankshaft and rods, could/should you buy ones for a 1.7L Type 4 bus engine, or pay the extra $$$ for the one that says "914" in the catalog?

I guess I'm just trying to figure out what components differ inside the engine between the "same engine" built for a bus or 914. Because I've noticed that Type 4 1.7L bus engine parts are cheaper than a Type 4 1.7L 914 engine parts and if some of this stuff is the same, I wanna save some money.
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raygreenwood
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PostPosted: Sun Aug 31, 2014 5:48 pm    Post subject: Reply with quote

The engine cases for 1.7, 1.8 and 2.0 are the same for 411, 412, 914 and bus....of all displacements. There are a very few minor detail changes none of which will prevent you from building any size engine you want. The exception are the last few years of bus cases with the cast over oil breather area...and even that is simple to get around.

The 1.7 and 1.8 in 411, 412, 914 and bus used the exact same crank, rods, timing gear, case and head castings. Made on the same production floor...all the same. The 1.7 in 411, 412 and 914 used the same domed piston.
The 1.7 in 411, 412 and 914 for California and the bus for everywhere with 1.7 used the same dished piston.

The 2.0 bus and 914 used the same crank, rods, timing gear but they used two differnt head castings. The 2.0 o ly came in bus or 914 so there is a casting unique to each.
However. ....a 1.8L bus, 412 or 914 head....all the same....can be flycut to make a servicable 914 2.0 head if bus or 914 2.0 castings cannot be found.....but its not the same effect.

Short of 914 2.0 heads.....which are unavailable new....there is not one single part forcanything in the Porsche 914 engines of any displacement...that is Porsche specific or must be bought from a Porsche dealer or supply house.

Exact but much better quality 2.0 Porsche replacement heads made on new castings, ported to shape with the spark plug angle properly relocated can be bought from HAM inc.
Even the original D-jet injection system of the 2.0 and 1.7 porsche are identical in every part # (differnt part # but exact cross match)....to the 1.7l from the vw 411 and 412. The only unique parts to the 914 2.0 are the runners, tb and center manifold section.
Ray
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DirtyCossack
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PostPosted: Sun Aug 31, 2014 9:48 pm    Post subject: Reply with quote

That's pretty much what I was guessing but wanted to be sure. Thank you.
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