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
> Building up a 1.7, Will it hold up?
Michael J
post Oct 19 2006, 08:32 AM
Post #1


Welcome to 2007
**

Group: Members
Posts: 268
Joined: 23-November 04
From: Olympia, WA
Member No.: 3,166
I am looking at another 914 which has a 1.7 that has been built to what the PO told the current owner is a 1972 cc, some sort of mild cam and carbs. The story is that the case had to be machined to get the big bore kit in. I thought that 96mm cyls equalled 1911cc on a 1.7 and didn't need any machine work???. So if this isn't just a story, and I will get to the facts before I part with any $, is the 1.7 case durable enough to withstand higher compression and generally more stress. Even if it makes 100 to 110 HP that is a big increase from stock.

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
blitZ
post Oct 19 2006, 08:45 AM
Post #2


Beer please...
****

Group: Members
Posts: 2,223
Joined: 31-August 05
From: Lawrenceville, GA
Member No.: 4,719
Region Association: South East States
According to one of Jake's broadcast, the early 1.7 cases are a bit sturdier than the later cases. If that's a 1972cc, then it's been stroked.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 19 2006, 08:47 AM
Post #3


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
A stock 2.0 is 1971cc. It sounds like they dropped 2.0 internals into a 1.7 case-

The 1.7 case is our choice for big performance engines!! I built my 3 Liter engine and the Mighty bSpyder engine both from 1.7 cases (235 and 257 HP respectively)

The 1.7 case is no different from a 2 liter, but in our development it has become very clear that the 1.7 case has better metallurgy than the 2 liter, this metallurgy promotes case strength at high mileage or heavy power output.

I am currently building a 350HP Turbo engine and starting on a 500+ HP Turbo engine, both based on the 1.7 case-
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Michael J
post Oct 19 2006, 09:04 AM
Post #4


Welcome to 2007
**

Group: Members
Posts: 268
Joined: 23-November 04
From: Olympia, WA
Member No.: 3,166
Thanks alot - Jake in particular. This helps as i try to find out just what this engine is.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post Oct 19 2006, 09:21 AM
Post #5


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
Is there a certain casting # to look for or are the 1.7 cases close to all the same?

slight (IMG:style_emoticons/default/hijacked.gif) sorry, Jake you have mentioned that a real efficiant combo is a 78/90, what about a 71/90 with 1.7 heads. will this work
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 19 2006, 09:21 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
I'll be doing a show on the 1.7-2.0 conversion in November...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TROJANMAN
post Oct 19 2006, 10:00 AM
Post #7


Looks nice in pictures.........
*****

Group: Members
Posts: 5,267
Joined: 5-March 04
From: Colorado
Member No.: 1,753
Region Association: None
QUOTE(toon1 @ Oct 19 2006, 07:21 AM) *

Is there a certain casting # to look for or are the 1.7 cases close to all the same?

The early 1.7 cases (someone said the "sturdier" ones) should have all started with a "W" (including the VW engines)
In '72, they went to "EA", and '73 to "EB".

User is online!Profile CardPM
Go to the top of the page
+Quote Post
toon1
post Oct 19 2006, 10:44 AM
Post #8


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
QUOTE(TROJANMAN @ Oct 19 2006, 09:00 AM) *

QUOTE(toon1 @ Oct 19 2006, 07:21 AM) *

Is there a certain casting # to look for or are the 1.7 cases close to all the same?

The early 1.7 cases (someone said the "sturdier" ones) should have all started with a "W" (including the VW engines)
In '72, they went to "EA", and '73 to "EB".


are there any differences between the cases externally?

I know a 2L bus case is different from a T4
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Oct 19 2006, 11:45 AM
Post #9


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
the only difference I can think of is the delete of the second oil pressure relief on GC cases.

There are differences internally on cases between W, EA, GA & GC
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
So.Cal.914
post Oct 19 2006, 11:57 AM
Post #10


"...And it has a front trunk too."
*****

Group: Members
Posts: 6,588
Joined: 15-February 04
From: Low Desert, CA./ Hills of N.J.
Member No.: 1,658
Region Association: None
The bus cases I've seen has the port for the mechanical fuel pump.

I've been running a 1.7--2.0 conv for 20 + years and I am not nice to it by

any means. I've rebuilt it a few times and the last time when I had the case work

done the machinest said the line-bore he did wasn't nessesary, that it was true.

I had the 1.7 heads fly-cut and ported them, I have been happy with the results.

All though I would trade them for some of Jakes... Any suc...ah.. takers.(IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Oct 19 2006, 12:40 PM
Post #11


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
QUOTE(So.Cal.914 @ Oct 19 2006, 10:57 AM) *

The bus cases I've seen has the port for the mechanical fuel pump.

I've been running a 1.7--2.0 conv for 20 + years and I am not nice to it by

any means. I've rebuilt it a few times and the last time when I had the case work

done the machinest said the line-bore he did wasn't nessesary, that it was true.

I had the 1.7 heads fly-cut and ported them, I have been happy with the results.

All though I would trade them for some of Jakes... Any suc...ah.. takers.(IMG:style_emoticons/default/smile.gif)


Well, those are the EC, GE,GD cases and have different external stuff for the buses.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
PORobinSCHE
post Oct 19 2006, 06:21 PM
Post #12


Member
**

Group: Members
Posts: 421
Joined: 22-July 06
From: Orlando,Fl
Member No.: 6,484
(IMG:style_emoticons/default/clap56.gif) WOWie,,, i love this site. i learn so much by just reading. now i have an even better gameplan for what upgrades on my 1.7L motor!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JPB
post Oct 19 2006, 06:29 PM
Post #13


The Crimson Rocket smiles in your general direction.
****

Group: Members
Posts: 2,927
Joined: 12-November 05
From: Tapmahamock, Va.
Member No.: 5,107
QUOTE(PORobinSCHE @ Oct 19 2006, 08:21 PM) *

(IMG:style_emoticons/default/clap56.gif) WOWie,,, i love this site. i learn so much by just reading. now i have an even better gameplan for what upgrades on my 1.7L motor!

Same here. Kinda makes me wanna keep the old four banger. (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 19 2006, 06:39 PM
Post #14


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
People never listen when we say that all Type 4 engines were created equally.. They think the 1.7 is a totally different, smaller engine that can't be upgraded... They think the 2.0 is also a bigger and stronger engine in every way- not true.

The 2.0 internals were derived from the 1.7... Internally and externally the dimensions of the cases are the same...

With that being said the 2.0s are my least favorite for cores for my engines, we don't use the "2.0 heads" anyway and the rest of the engine is usually worn more than the 1.7 counterparts that are years older..

I build all my full race engines on 1.7 cases (IMG:style_emoticons/default/driving.gif)

I have a lot of new writings being released over the winter on this topic.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post Oct 19 2006, 07:08 PM
Post #15


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
Hey Jake, can you use a 2l crank with the 90mm pist and cyl. setup.

I'm sure it has been asked before but I don't know the answer
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 19 2006, 07:37 PM
Post #16


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
you could, but the pin height of the pistons would mandate .200+ cylinder shim...

For a Turbo it would be beneficial, othewise its a waste of time
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toon1
post Oct 19 2006, 07:42 PM
Post #17


Senior Member
***

Group: Members
Posts: 1,849
Joined: 29-October 05
From: tracy,ca
Member No.: 5,022
Thank's Jake
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

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

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 8th May 2024 - 10:31 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...