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Wed Nov 12, 2008 11:19 pm

I know there have been posts about this in the past but I can't seem to find any of them.

Are Type 1 and Type 3 single port heads (for carburetors) the same?

If not what are the differences?

Were Type 3 heads for dual carbs dual port heads or single?

What about FI heads?

Any info you could provide would be helpful.

thanks,

-Sean

Thu Nov 13, 2008 4:25 am

Actually the only reason we have dual port heads is they were needed for the fuel injected engine. The heads were single port on Type 3 vehicles until the intro of FI on the 68 year model so all 1500 engines as well as a couple of years of the 1600 engines were single port. The single port ones work great in a stock setup and gave the same HP rating as the DP ones according to VW. I think valve sizes were the same in the type 1 single port single carb 1500 engine and the type 3 1500. The single port 1600 engines may have had larger valves

Anyone else on this one?

DH

Thu Nov 13, 2008 6:46 am

In 67 they changed type 3 over to dual port, The FI heads have smaller valves in them, I think 35.5X30, or 32X30 I can't remember, other heads did not have bigger valves to my knowledge, they all had 35.5 int. and 32 exh.

Thu Nov 13, 2008 8:49 am

Early buses had smaller valves, but they were a different design heads.
Once they went to the new style rockers, (square boss), all single ports are the same. In fact if you look at a T-1 1500/1600 single port, it has a 311 casting number.
So, yes, single port late model heads were the same.
Very early T-3, single port engines, had their own heads. These were 1500 single port, single side draft carb. The intake port was verticle, not angled.

Thu Nov 13, 2008 3:17 pm

Euro 67 wrote: In 67 they changed type 3 over to dual port, The FI heads have smaller valves in them, I think 35.5X30, or 32X30 I can't remember, other heads did not have bigger valves to my knowledge, they all had 35.5 int. and 32 exh.

That of course was late 67 which is the 68 model year (changeover around August)

DH

Thu Nov 13, 2008 3:44 pm

Aug of 66, had the change, welcome to the USA I have a verified 67 OG type 3 motor, that's where I got my dual port carbs from.

Thu Nov 13, 2008 4:07 pm

DHanna wrote: Euro 67 wrote: In 67 they changed type 3 over to dual port, The FI heads have smaller valves in them, I think 35.5X30, or 32X30 I can't remember, other heads did not have bigger valves to my knowledge, they all had 35.5 int. and 32 exh.

That of course was late 67 which is the 68 model year (changeover around August)

DH

The smaller valves is true for the Type 1 fuel injection, not the type 3.
The type one FI heads were also lower compression ratio.

Thu Nov 13, 2008 4:24 pm

Russ Wolfe wrote: Very early T-3, single port engines, had their own heads. These were 1500 single port, single side draft carb. The intake port was verticle, not angled.

I bet those are easy to find. #-o

Thu Nov 13, 2008 6:19 pm

US Beetle 1300s were single port but had 32x30 valves. These were imported only for the 1966 model year. 1967-1970 USA's SP Type 1 engines (1500cc thru '69, and 1600cc for '70) all had the same valve sizes, 35x32, the same sizes as the T3 had in their 1600 DP FI.

Thu Nov 13, 2008 6:26 pm

DHanna wrote: Euro 67 wrote: In 67 they changed type 3 over to dual port, The FI heads have smaller valves in them, I think 35.5X30, or 32X30 I can't remember, other heads did not have bigger valves to my knowledge, they all had 35.5 int. and 32 exh.

That of course was late 67 which is the 68 model year (changeover around August)

DH

US model 67's got DP heads on them AFAIK...

Thu Nov 13, 2008 10:13 pm

localboy wrote: Russ Wolfe wrote: Very early T-3, single port engines, had their own heads. These were 1500 single port, single side draft carb. The intake port was verticle, not angled.

I bet those are easy to find. #-o

As stated above, maybe the pre production pics and even test engines may have used modified 1200 40HP heads to have the vertical rather than angled inlets. Did they use leftover 40 HP INTERMEDIATE engine heads from the Type 2 range engine on the first pre production engines???

The heads on both 1200 40HP and the early 1500 gave more than their share of trouble with pulled rocker shaft studs requiring modified studs to be fitted to the boss. Gave the advantage of the smaller valve clearance as the clearance got larger as the engine gained heat.

By the way! You guys are lucky with all the 1500S Notches over there. They are like rocking horse sh#t over here with only about 2 known ones on the road in Australia!

DH

Fri Nov 14, 2008 9:34 am

The early 1500 bus used the T-3 heads. Not the straight intake, but the angled intake.
The T-3 engine preceded the 1500 bus.
Yes, the early T-3's had problems with pulled studs. VW did not start using the later rocker design until 1965.