Mahle Piston Ring Question.....
Posted: Mon May 11, 2009 6:15 pm
As a few of you know ive been rebuilding the bottom end in my impreza, i got the bits last friday but then realised ive been sent oversized piton rings. i emailed the seller (advanced automotive performance) and heres what was said:
i sent this:
----- Original Message -----
From: stuart jackson
To: enquiries@advancedautomotives.com
Sent: Saturday, May 09, 2009 8:20 PM
Subject: Problem with order
hello again,
just a quicky, i received the items on friday morning, around 11.30am and got to work straight away. when i got to the point of installing the pistons and rings i took the engine block a place in norwich ive been using for a few years now, to get the rings gapped.
while there, we suddenly realised that ive actally been sent 92mm pistons but 92.50mm piston rings (as it says on the box they came in)
unfortately, these rings will not fit my standard 92mm bore block and conciquently has put my completion date back even further. even if i could get these oversized rings gapped and fited, since the circumference is oversized, this would put too much stress on them and could seriously damage my block.
can you please ring me ASAP on 0777*****63 or just send out a new set 92mm rings to my address.
many thanks, Stuart.
and i got this reply:
Hello Stuart,
The Mahle forged piston kits have a file to fit piston ring system just like most other top end piston manufacturers. The 92.5mm ring set is used in the standard bore kit and 92.5mm kit as both bore sizes still require the rings to be gapped, even when the 92.5mm rings are fitted to the 92.5mm bore, the gap is still too small. The reason for the file to fit system is too allow engine builders to set their own gap depending on the bhp, fuel and road/track. This is why one gap will not suite all. The stress that you mention is not the case at all. Perhaps your guys in Norwich should know this but may be they have never used top end forged pistons before. We have used countless Mahle pistons in our engines and besides this who are we to argue with Mahle on their ring system.
I hope this clears it up.
Regards Cath
does this seem right??
has anyone else ever used Mahle pistons/rings and had a similar experience? :? :?
cheers, Jacko
i sent this:
----- Original Message -----
From: stuart jackson
To: enquiries@advancedautomotives.com
Sent: Saturday, May 09, 2009 8:20 PM
Subject: Problem with order
hello again,
just a quicky, i received the items on friday morning, around 11.30am and got to work straight away. when i got to the point of installing the pistons and rings i took the engine block a place in norwich ive been using for a few years now, to get the rings gapped.
while there, we suddenly realised that ive actally been sent 92mm pistons but 92.50mm piston rings (as it says on the box they came in)
unfortately, these rings will not fit my standard 92mm bore block and conciquently has put my completion date back even further. even if i could get these oversized rings gapped and fited, since the circumference is oversized, this would put too much stress on them and could seriously damage my block.
can you please ring me ASAP on 0777*****63 or just send out a new set 92mm rings to my address.
many thanks, Stuart.
and i got this reply:
Hello Stuart,
The Mahle forged piston kits have a file to fit piston ring system just like most other top end piston manufacturers. The 92.5mm ring set is used in the standard bore kit and 92.5mm kit as both bore sizes still require the rings to be gapped, even when the 92.5mm rings are fitted to the 92.5mm bore, the gap is still too small. The reason for the file to fit system is too allow engine builders to set their own gap depending on the bhp, fuel and road/track. This is why one gap will not suite all. The stress that you mention is not the case at all. Perhaps your guys in Norwich should know this but may be they have never used top end forged pistons before. We have used countless Mahle pistons in our engines and besides this who are we to argue with Mahle on their ring system.
I hope this clears it up.
Regards Cath
does this seem right??
has anyone else ever used Mahle pistons/rings and had a similar experience? :? :?
cheers, Jacko
