Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> Bigger cylinder/piston options for us 1.7/1.8 guys besides 96's?
Mueller
post May 14 2015, 04:44 PM
Post #1


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None



Seems all the bigger piston and cylinder kits on AA or EMW is geared towards the 2.0 based motors with the longer stroke.

Is there a reason for this besides people just wanting to maximize the CC of their motor build money?

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TheCabinetmaker
post May 14 2015, 05:45 PM
Post #2


I drive my car everyday
*****

Group: Members
Posts: 8,300
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666



Very good question. I await the answer.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bob L.
post May 14 2015, 06:13 PM
Post #3


Senior Member
***

Group: Members
Posts: 847
Joined: 7-August 11
From: Austin TX
Member No.: 13,411
Region Association: Southwest Region



The cases are all the same. As long as it is good condition you can start with a 1.7, 1.8 or 2.0.

IIRC Jake said he likes the 1.7 cases because they have had an easier life. I'm not qouteing him, but something like that.

2.0's have a longer crank (71 vs 66mm)but if you want more than 71mm stroke, you're replaceing it anyway. Otherwise it's just P's&C's, head work, exhaust, wideband... (IMG:style_emoticons/default/beer.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post May 14 2015, 09:41 PM
Post #4


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None



QUOTE(Bob L. @ May 14 2015, 05:13 PM) *

The cases are all the same. As long as it is good condition you can start with a 1.7, 1.8 or 2.0.

IIRC Jake said he likes the 1.7 cases because they have had an easier life. I'm not qouteing him, but something like that.

2.0's have a longer crank (71 vs 66mm)but if you want more than 71mm stroke, you're replaceing it anyway. Otherwise it's just P's&C's, head work, exhaust, wideband... (IMG:style_emoticons/default/beer.gif)



It seems the pistons that are in the kits are for the longer stroke...sure new pistons can be made for the shorter stroke crankshaft, but I would think the price would be higher...or perhaps not?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post May 14 2015, 10:03 PM
Post #5


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None



Bigger cylinders have sealing issues.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post May 15 2015, 07:26 AM
Post #6


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States



LN will make a piston with any pin height that you desire.

I have a 69X106.3 combo that works great using the 17/1800 rod length ands I have also done this with a factory 66 stroke crank, using the 105.07mm bore size.

Head sealing is an issue when using cylinders and hardware outside the Nickies line up.

In general I prefer stroke over bore hen increasing displacement.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post May 15 2015, 07:30 AM
Post #7


Custom Member
***************

Group: Members
Posts: 24,574
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States



QUOTE(Mueller @ May 14 2015, 11:41 PM) *

QUOTE(Bob L. @ May 14 2015, 05:13 PM) *

The cases are all the same. As long as it is good condition you can start with a 1.7, 1.8 or 2.0.

IIRC Jake said he likes the 1.7 cases because they have had an easier life. I'm not qouteing him, but something like that.

2.0's have a longer crank (71 vs 66mm)but if you want more than 71mm stroke, you're replaceing it anyway. Otherwise it's just P's&C's, head work, exhaust, wideband... (IMG:style_emoticons/default/beer.gif)



It seems the pistons that are in the kits are for the longer stroke...sure new pistons can be made for the shorter stroke crankshaft, but I would think the price would be higher...or perhaps not?

you can get any pin height forged piston you want from the typical piston manufacturers....
I have JE pistons, and you call them to give them all the details you want, they are made to order if you want, but they do stock some normal sizes
Get you head into Chevy and measure up those....the stuff is available cheaper and some of the sizes are close to what we want. (pistons)


BUT, you should still stuff the motor in there and get it running so you can drive it....its fast enough to get you in plenty of trouble.

rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post May 15 2015, 11:04 PM
Post #8


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022



Not much of interest in short stroke for these engines would be my guess.

the one engine build that still really intrigues me is the 78mm stroke with the 90.5mm bore. a torquey gas mizer

this was the basis for Jakes super two liter,
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post May 16 2015, 02:00 AM
Post #9


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,849
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California



Dilemma - I'm in the process of tearing my wife's 1.7L D-jet motor apart for a rebuild. At first, I was going to rebuild what was in there - bone stock.

Recently, I've thought about going a little bigger, but want to keep the existing FI system pretty much as is and keep the car fairly reliable (whatever that means, being a 914) (IMG:style_emoticons/default/laugh.gif)

If the 66mm crank and rods check out OK, maybe just a little increase with 94mm P&Cs and a little more aggressive cam. Is this a wise choice? … and an experienced FI guru can list any pitfalls I may encounter?

(IMG:style_emoticons/default/popcorn[1].gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post May 16 2015, 07:17 AM
Post #10


Custom Member
***************

Group: Members
Posts: 24,574
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States



You will need to do head work on those heads, or do yourself a favor and get new AMC castings for the 1.8 heads and port design.

Then get a set of 96mm pistons and cylinders from EMW...

Simple build
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 14th May 2024 - 01:23 PM