MotoIQ Forums
Welcome Guest! To enable all features please try to register or login.
Options
Go to last post Go to first unread
moranor  
#1 Posted : Saturday, August 08, 2015 10:06:21 PM(UTC)
moranor

Rank: Newbie

Reputation:

Groups: Registered, Registered Users, Subscribers
Joined: 7/8/2015(UTC)
Posts: 4

Hi Guys

what are your thoughts

would you think running this base file on a supercharged BMW M3 S54 for 10 months is safe:
full throttle AFR
[img]https://lh3.googleusercontent.com/paCCFqpWIyTOj2jetDSSL5iezOkNEJtNsK91cmaMzvI=w944-h643-no[/img]

https://lh3.googleuserco...sK91cmaMzvI=w944-h643-no

part throttle AFR

https://lh3.googleuserco...526dpWZnvSg=w853-h643-no

if not what sort of damage would you expect

Edited by user Saturday, August 08, 2015 10:10:03 PM(UTC)  | Reason: cant get pics to work

smartbomb  
#2 Posted : Friday, August 14, 2015 2:15:10 AM(UTC)
smartbomb

Rank: Advanced Member

Reputation:

Groups: Administrators, Editors, MotoIQAdmins_Members, Registered, Registered Users, SocialGroup_Admin, Subscribers, Suspension102_Members, Welcome_Members
Joined: 11/2/2014(UTC)
Posts: 103

Was thanked: 10 time(s) in 10 post(s)
Looks like the AFR at WOT at high RPM is rich but safe. Is this a stock bottom end car with stock compression on pump gas? If it is a lower compression motor or if you are running low boost I would like to see the AFR more in the low 11's.

There a lot of weird things going on in the AFR at low rpm and assuming that the load is high, it needs to be cleaned up. Not sure if you are reading closed throttle fuel cut or not though.

Definitely needs more tuning.
moranor  
#3 Posted : Saturday, August 15, 2015 12:43:16 AM(UTC)
moranor

Rank: Newbie

Reputation:

Groups: Registered, Registered Users, Subscribers
Joined: 7/8/2015(UTC)
Posts: 4

Thanks for your response :)

thought it would be better to look at the AFR in isolation but i guess it would be best to get all the facts out on the table and look at it as a whole

compression ratio was 11.3 to 1 was was done with a thicker head gasket pump gas was used

bottom end was fully build with 11.5 to 1 forged pistons, rods and bearings from Vac I can get the details on all parts used if needed

the block was re-sleeved with 87.5mm bore

unfortunately this engine failed and lost compression in two cyl
we are not sure if it was the base file for 10 months, engineering or the engine build

No sign of fuel/bore wash. Honing pattern is still intact, No rings have failed.

Block is cracked between cylinders 4 and 5. Sleeves cracked in all cylinders
on

there are signs of detonation from what I was told and should have pictures next week of the pistons

Bearings seem fine. Crank is being inspected. Rods seem fine

UserPostedImage
UserPostedImage

Edited by user Saturday, August 15, 2015 12:46:33 AM(UTC)  | Reason: Not specified

smartbomb  
#4 Posted : Sunday, August 30, 2015 11:09:56 AM(UTC)
smartbomb

Rank: Advanced Member

Reputation:

Groups: Administrators, Editors, MotoIQAdmins_Members, Registered, Registered Users, SocialGroup_Admin, Subscribers, Suspension102_Members, Welcome_Members
Joined: 11/2/2014(UTC)
Posts: 103

Was thanked: 10 time(s) in 10 post(s)
Looks like bad detonation. I would say a lot of it is tuning.
Users browsing this topic
OceanSpiders 2.0
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF.NET | YAF.NET © 2003-2018, Yet Another Forum.NET
This page was generated in 0.487 seconds.

Notification

Icon
Error

© 2018 MotoIQ.com