Engine rebuild 1.8L to 2.1L, Daily driver with a kick! |
|
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. |
|
Engine rebuild 1.8L to 2.1L, Daily driver with a kick! |
ScottD914 |
Apr 12 2009, 10:54 AM
Post
#1
|
Member Group: Members Posts: 69 Joined: 27-December 07 From: New London, CT Member No.: 8,506 |
Gentleman (and Ladies): I'm wrapping up my frame/ body repairs on my '74 and turning my attention to my stock 1.8L carburated power plant.
With so many variables to consider, I thought I'd throw it out to you for your thoughts on a good combination. (IMG:style_emoticons/default/stirthepot.gif) Starting with a stock 1.8L, the goal is build an engine with a balance of power and efficiency for a daily driver with a kick. What I have found so far, for consideration is: 1. Increase displacement with a longer stroke: 71mm to 78mm (and corresponding rods) 2. Larger P/C's from 90.5mm to 94mm (or 96mm) 3. Mild cam (Webcam 86a or 494) 4. Switch to dual carbs vs. the current single. This combo would provide an increase from 1.827L to 2.165L The questions that come up are: 1. Will this combo meet the goal? 2. Are 1.8L heads okay on this engine or do I need to find 2.0L heads? (the 86a cam would require better valve springs I gather) 3. Should I lighten up the flywheel? One other biggie, since I'm in the Northeast: Where can I have machine work done? Loads of places in CA, do I need to ship my heads and possibly the case out to CA or is there someone closer? There's a lot of wisdom and experience out there, any help would be greatly appreciated and might save me a couple bucks! Thanks! ScottD (IMG:style_emoticons/default/aktion035.gif) |
r_towle |
Apr 12 2009, 02:20 PM
Post
#2
|
Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Lets start with some of the simple questions.
The 1.8 liter heads are the ones that have been used for hotrodding for many years. They have alot of meat to work with and they are less prone to cracking then the 2.0 liter ones. Given that, the big difference is the location of the plug. H.A.M states that its worth at least 10HP to move the plug to the 2.0 liter location. New valves and valve seats are a must. Plan to spend money on the heads. HAM is located in Georgia, use him for the heads. For the heads and cylinder work..use HAM. He is on the east coast. For the case, find a local machine shop to blueprint your case, or clean it up and ship it to HAM... I have had good success with local shops for the case work...its not rocket science. Do blueprint the case...ensure you have all your deck registers machined flat to the centerline of the case/crank. Have the shop measure up the crank journals BEFORE you do anything with the case...then decide from there. These cases are fairly rugged and dont typically have the need for line boring, so dont believe it without VALID measurements to prove it... Talk to Jake about some decent engine combos and think about buying a kit that is complete and proven. Rich |
Lo-Fi Version | Time is now: 15th May 2024 - 03:26 AM |
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 ... |