converting 1500 SP to 1600 DP

BrianD · Post by **BrianD** » Wed Feb 19, 2003 9:57 am

What is needed to convert my heads from SP to DP will they mount right up? I know the obvious like Intake but what about exhaust and head studs? What about compression ratio if I change the P/C to 1600 will stock 1600DP heads work?

Thanks for any insight

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67 beater bug (commute)
92 ford explorer (exploring)
98 dodge stratus (cruising)

JC-ATL · Post by **JC-ATL** » Wed Feb 19, 2003 10:25 am

You'll need four short head studs. They go in the top row, center two, of each side. Of course, you'll need a DP intake.

If you change the P/C to 1600, stock 1600dp heads will work. However, I'd go ahead and cc your heads and check your deck height, just to make sure there's no significant change in compression.

Hoxviii · Post by **Hoxviii** » Wed Feb 19, 2003 1:47 pm

If you do convert, send me the heads!

Justin

69NoH20 · Post by **69NoH20** » Wed Feb 19, 2003 1:58 pm

IF you are interested I have a pretty much new dp intake with the apropriate carburator and exhaust system if you were interested in purchasing them email me at [email protected]. Let me know.

BrianD · Post by **BrianD** » Wed Feb 19, 2003 11:46 pm

Thanks,

Ok, now how would I cc the heads? I understand the deck height.

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67 beater bug (commute)
92 ford explorer (exploring)
98 dodge stratus (cruising)

JC-ATL · Post by **JC-ATL** » Wed Feb 19, 2003 11:50 pm

A multitude of the VW vendors supply a head cc kit with a syringe or burette and a lexan plate to cover the combustion chamber.

The basic process is to fill the combustion chamber with a measured amount of liquid to determine the volume thereof.

Post by **Marc** » Wed Feb 19, 2003 11:51 pm

If you'll be using a stock DP intake manifold you'll have to replace one 8mm case stud with a longer one to pick up the center mounting point on the manifold. You can trim SP overcylinder tin to fit but it won't have the proper internal directional tab and will leak cool air, so get the right stuff. As I point out every time this subject arises, most SP cases are not up to the stresses imposed by performance modifications - this could be the "kiss of death" for your engine. What's the case number?

BrianD · Post by **BrianD** » Thu Feb 20, 2003 12:08 pm

I will buy new tins

Marc,
The case (H??? maybe) it is original in a 67 beetle.

I will be going to dual carbs but stock 1600 p/c's with header exhaust w/exchangers.

If this is a kiss of death please let me know.

Hoxviii,
what do you do with them? if you don't mind me asking.

thanks guys

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67 beater bug (commute)
92 ford explorer (exploring)
98 dodge stratus (cruising)

Post by **Marc** » Thu Feb 20, 2003 12:28 pm

A `67 H0 case isn't as bad as the H5s used in `68/`69 but it's still 35+ years old and without putting steel inserts into the headstud threads I wouldn't try to hotrod it. If that's already been done, the biggest concern is that it has rather small oil passages but with a good pump and cooling system it would be OK for a street 1600DP.

mharney · Post by **mharney** » Thu Feb 20, 2003 12:28 pm

smoooch - ack! *plop*

Big time.

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My VW Page-Updated 02/17/2003
Why? Because I wanna go WEEEEE!!
Gonads and strife!

Hoxviii · Post by **Hoxviii** » Thu Feb 20, 2003 4:42 pm

All I do are SP motors and you can never have too many heads laying around.

Justin

69NoH20 · Post by **69NoH20** » Thu Feb 20, 2003 8:38 pm

Sorry I dont have any cooling tin but i do have the stuff I already listed. Let me know if you are interested at all.

BrianD · Post by **BrianD** » Fri Feb 21, 2003 7:49 am

Justin,

I am just curious how much power can you get in a SP. What would I have to do, I would like to stay SP if it is worth my time and money.

All I want is more power and good mileage.

My motor has around 100K on it now.

thanks

Post by **Marc** » Fri Feb 21, 2003 8:04 am

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by BrianD:
<B>...All I want is more power and good mileage.
</B><HR></BLOCKQUOTE>

You can tweak a 1600SP up to 70HP or so and still be "streetable" but my concern about the adequacy of the case for a higher-performance engine applies regardless of the type of heads in use. A solid "stock" 1600SP (1970-ish) in a `67 car isn't a rocket but should be able to stay out of trouble in traffic and still pull down ~30mpg; what else/more are you after?

69NoH20 · Post by **69NoH20** » Fri Feb 21, 2003 4:45 pm

I think one of the biggested restrivtions on any VW engine is the carburator. The VW engines got chocked down so much by some of the smaller carburators that they simply could not make enough power or rev high enough to any damage to the internal components. By simply bolting on a bigger carb, within reason, you should free up a few hp.