67 S engine questions

Lyndon302 · 10-19-2018, 07:57 PM

I have a 67 s engine. Thoughts please.
Bore and new wosner pistons. Along with all the usual other bits.
Or some 2.7 barrels pistons and heads. They are so well priced and get nikasil.
I have 40 mm webers on it and Msd ignition.

I know this is fairly sought after engine so would the boring of the spigits devalue it.

I'm only after a fresh engine that is sorted and runs well. I have no desire to increase performance.

Opinions please.
Thanks Lyndon

stownsen914 · 10-20-2018, 04:26 AM

I'd think with the value of 67 S cars where it is, originality might be in your best interest. Especially if you're not looking to increase power ... the 67 S makes 160 hp DIN, which is ~180 hp SAE. A properly tuned early S is a barrel of monkeys to drive. My opinion only ...

Scott

ficke · ficke's Garage

I think going the 2.7 route with your 67S is a bad idea for many reasons.
Yes, modifying the case by boring it for bigger cylinders will lower the value of a valuable case. I believe a sand cast case unmolested is worth between 7-10K. Last one I sold had been line bored spigots bored and broken fins and I got 5k for it.

The high revving earlier engine was a unique experience that not many can share, why lose it for a common engine?

The 2.2 P&C or much cheaper than the 2.0 so you could go that way and have more displacement, still rev to the moon and save some money.
Change the heads to the 2.2/2.4 heads to match your bigger cylinders.
High compression 2.0 911 engines, 9 to1 or higher, need twin plugging or IDS carbs to not detonate at full throttle. by going 2.2 you can avoid that mess altogether.

Matt Monson · 10-20-2018, 07:04 AM

Don’t bore a 67S case. That’s like taking a chisel to a marble sculpture to improve it. As mentioned, a 2.0l S engine is a wicked little beast. Rebuild it to 906 spec if you want it to be really mean. Though some prefer to actually detune it a bit and put in E or solex cams for a broader power band. Not so pesky.

Lyndon302 · 10-20-2018, 01:13 PM

Ok. What I thought. If its good a bore and next size wosners.
For your info the car is not an S. I'm just lucky my 68 has a 67 S engine in it.
Thanks for your opinions.
Lyndon

stownsen914 · 10-21-2018, 04:27 AM

Keep in mind octane requirements if you are considering bumping up the compression ratio. I think stock is 9.8:1, and with the sub-optimal 2.0L heads, premium pump gas is already marginal. With higher compression you'll need to boost the octane even for spirited street driving. Dual plugs might be an interesting upgrade, now that I think of it.

Steve@Rennsport · 10-21-2018, 07:56 AM

JMHO,.....

We've done quite a few of these 2.0S motors and IMHO, making them into a 2.2 makes all the difference in the world without destroying its originality & value.

This package performs better than expected.

Lyndon302 · 10-21-2018, 12:52 PM

That's including the 2.2 heads ?. What comp pistons. Still running the S cams and stock webers.
Thanks lLyndon

Flat6pac · 10-21-2018, 03:24 PM

2.2 S is 9.8 cr
The easiest way around the heads is 2.7 S with large intake and exhaust ports
Already from factory
Bruce

Lyndon302 · 10-21-2018, 04:16 PM

Ok the heads are sorted. .
2.2 barrels with no spigot maching.
My cam boxes will fit ??
My S cams or ???
S pistons ???
I have 40 mm webers
Thanks Lyndon

ficke · ficke's Garage

No machining of case for 2.2
2.7 heads are common and cheap and will fit and as mentioned have big valves and better combustion chamber than the 2.0 heads.

Cam box will fit.

For pistons shoot for the 9.5 to 1 ratio and you will be fine on pump gas and single plug.
Carbs will work fine, just ventury them and jet them for this engine.

Lyndon302 · 10-21-2018, 06:47 PM

Sounds doable. I've been reading about AA barrels with JE pistons. The Chinese barrels seem ok ?? Its just a weekend car

The S cams ??? Keep or swap over ??
Thanks Lyndon

ficke · ficke's Garage

Keep the S cams, I personally like them some prefer a little milder like the "Solex" but with the bump in displacement I would certainly stay with the S Grind.

I do not have any personally experience with Chinese Cylinders.

In the past I have had bad experiences with cheap parts and just do not go there any more, they were a false economy for me.

Steve@Rennsport · 10-22-2018, 07:19 AM

Quote:

Originally Posted by Lyndon302

Sounds doable. I've been reading about AA barrels with JE pistons. The Chinese barrels seem ok ?? Its just a weekend car

The S cams ??? Keep or swap over ??
Thanks Lyndon

Do NOT use those cylinders no matter how you use the car (IMHO). Pure junk.

Save your money and buy Mahle. Do it once & do it right!

Pinching dollars here degrades the value in a big way since a potential buyer will need to spend some serious money to replace them.

Lyndon302 · 10-22-2018, 09:23 AM

https://www.ebay.com/itm/Porsche-911-S-Piston-Cylinder-2-2-L-84-00-mm-9-8-1-6-MAHLE-NEW-NS/152473846917?hash=item2380264485:g:bFAAAOSwqrtWnuS H

I can't seem to find 2.7 S heads. All seem to be CIS. Did they make two different heads from 74 to 77. ??
Thanks Lyndon

NICE 69 S · 03:22 PM

Read this, it should answer some questions. Post #2 for valve and port size, post #6 for my 2 cents.
You may want to find a set of 2.2T heads that do not have the provision for an injector in the intake port. P/N 911.104.306.0R . These have the same ports as the 2.2E heads (32/32), so you may be good to go with just a valve job and no porting. If you do decide to port, I don't think I would go all the way to 36/35 that the "S" heads have. 2.2E motor is a very good driver.
Bob B

2.0 Heads question

Lyndon302 · 10-22-2018, 03:19 PM

I'm no expert but i think all 2.7 where injected
Lyndon

Matt Monson · 10-23-2018, 06:16 AM

The cis doesn’t matter. Youjust plug the hole on the head for the injector.

pors1968 · pors1968's Garage

Get carb head 70-72T if you use cis74-77 find S port are bigger no to plug injector they are in runner tube the only cis 73-5 use injector in head like mfi

Lyndon302 · 10-23-2018, 12:04 PM

Would I need big ports on a 2.2.
Lyndon