Home  
Site Partners: SpotterGuides Veloce Books  
Related Sites: Your Link Here  

Go Back   TenTenths Motorsport Forum > Racing Talk > Racers Forum

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 22 Apr 2010, 19:53 (Ref:2678035)   #1
Copperbottom
Veteran
 
Join Date: Mar 2007
Posts: 775
Copperbottom has a lot of promise if they can keep it on the circuit!
Advice needed,rolling road problem

I'll try to cut a long story short: On wednesday 14th April I had my brand new engine run in and set up on a rolling road (I won't mention any names),it had about an hours' running at different revs before the 1st power run showed it to be running way too weak so larger main jets were fitted into the carbs,still too weak so larger still jets (180s) were fitted and the power came up along with the co level at high revs,the operator then fitted some 200 air correctors, ran it up to 7000rpm and said that'll do. He then tweaked the ignition timing and did a couple more power runs to find the best setting.
On Saturday I went out for qualifying,completed 3 slow laps to let everything warm up then as I came out of clearways went for a quick lap changed from 3rd to 4th at 7000rpm only to find that the car slowed down! I checked the temps and oil pressure but they were fine so pulled into the pits to have a check under the bonnet only to find a heavily breathing engine so I limped back to the paddock,left it to cool down and removed the head to find that no1 and no4 pistons had holes in them from detonation!!

Who is responsible? The engine wasn't touched between the car being loaded onto the trailer and taking the head off after qualfying.
The carbs,pump,distributor etc were used on my old engine which I actually refitted saturday night so that I could race on sunday and it ran like a dream after I swapped back to the old mains/airs.

One thing that I have found is that the air correctors that were fitted to my new engine are all different sizes! 1 is 2mm (200) 1 is slightly larger and the other two much bigger.

Engine is an 1800cc (85.9mm bore) ford crossflow with twin 45 Weber carbs on 38mm chokes.

It looks like I'm going to have to buy 12 pistons just to get the 2 that I need as they are no longer made and the maker will only produce them in batches of 12!

Your views please Gents.
Copperbottom is offline  
Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
ROLLING ROAD SUN/MAHA RAM X11 2WD the-enginetuner Racing Technology 2 10 Oct 2009 22:48
rolling road tuning lynx ae Racers Forum 23 27 Feb 2009 11:18
Rolling Road Reccomendation Dan Friel Racing Technology 10 11 Aug 2003 12:04
Rolling road results spanner Road Car Forum 7 24 Jun 2003 00:13


All times are GMT. The time now is 13:21.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Original Website Copyright © 1998-2003 Craig Antil. All Rights Reserved.
Ten-Tenths Motorsport Forums Copyright © 2004-2021 Royalridge Computing. All Rights Reserved.
Ten-Tenths Motorsport Forums Copyright © 2021-2022 Grant MacDonald. All Rights Reserved.