USE CODE: B094VQ88X2 - This Amazon Pick is Recommended by Saabnet.com!
Site News - 7/11: No New News Today | 5/10: Members: Log In to See Fewer Ads!
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

Performance Bulletin Board
[Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Timing concerns with 6BTM and stock actuator (long)
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by JoeT [Email] (more from JoeT) on Fri, 8 Nov 2002 09:03:59 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

Hey all, (Kevin K especially)

I run a high performance c900t with LH2.4.

To avoid further questioning, here are the engine mods I can think of:

Shot peened engine block
Lesco custom 2.1 cylinder head, 3 angle valve job, porting, cc mods
2.1 intake manifold and fuel rail
Lesco Stage II crower style regrinds with Lash caps
Custom Dave Kennedy Cosworth compressor/impeller in a T-3, bored very oversized
Intercooler Fan from George's imports
84 8V turbo pistons (Mahle, new), lower CR
SPG9 RRFPR
SPG9 Dawes valve
SPG9 Big bore throttle body
SPG9 Stage II APC box with my own personal mods
SPG9 30lb/hr injectors with dash mounted AMM pot set at 300 ohms
(adjustable)
Bosch 18 PSI BOV
MSD 6BTM ignition system
9000 2.3t flywheel and clutch kit
5 speed conversion with factory rebuilt 5 speed from sweden (first gear is way too low!)
K+N free-standing air filter kit (necessary to allow intercooler fan to fit)

Ok, these concerns go out to Kevin K and others:

At exactly 16 deg BTDC, I am getting impressive engine knock at light boost (2-5 PSI and medium loading. I run a knock light in the dash from Pin 19 of APC. I am using a stock distributor actuator with no modifications. Currently I have the boost retard knob set to 0.75 and I persist in having this problem. Consequently, I have had to retard timing by several degrees in order to get rid of the knock. This has certainly affected acceleration.

The engine only has 400 miles on the odometer. A compression test revealed a high reading of 180 PSI across all cylinders. I was expecting more around 140-150. I can't see how this reading is so high especially when I went with a larger cylinder head and lower cr pistons. Not the best scenario when I have a turbo capable of maintaining 20 PSI at 6,000 RPM (It's that good).

I am in a dilemma because I am certainly not getting the performance I am expecting (approx. 250-270 HP). And with all the talk about how many have adjusted their timing to 20 deg BTDC, bent the actuator arm for less initial retard, and set their BTM knobs to 0.5, if I did that I would surely melt a piston in the first half hour. RRFPR is adjusted to 1.9 at idle, as specified. Cams are timed correctly as I verified last night.

Does anyone have any idea why I am having this timing problem? At idle the engine runs pretty darn good. It has a slight lope because of the cams, but it doesn't rattle my fillings out, and when warm is pleasing to the ear. This engine, as designed, should throw me back in my seat, but unfortunately, it doesn't. I have built a few engines in the past, with no problems.

Please help!






posted by 136.1.1...
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2025 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!