NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   Lapping Necessary (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/lapping-necessary-43772/)

84stock 01-26-2005 01:40 PM
[attachment=27568:attachment][attachment=27569:attachment][attachment=27570:atta

hment]I have a 13b in my SE and am ordering a cmden 7inch for it (not the efi one). Has anyone done rebuilds without lapping? I only have 140,000 km (95,000 miles) on my engine. If I don't rebuild, they only suggest 5-7 lbs of boost. I would like to rebuild, streetport and use a 12a centerplate I have as well for more flow (perhaps even bridgeport the centerplate). I could use the video and do it myself without lapping unless there is a way to hand lap the plates myself. Any suggestiongs??? (Don't say turbo)

banzaitoyota 01-26-2005 01:42 PM
Depends on the condition of the irons and what the Step-Wear Measurement is

Rotary Sensei 01-28-2005 02:20 AM
Originally Posted by 84stock' date='Jan 26 2005, 11:40 AM
[attachment=27568:attachment][attachment=27569:attachment][attachment=27570:atta

hment]I have a 13b in my SE and am ordering a cmden 7inch for it (not the efi one). Has anyone done rebuilds without lapping? I only have 140,000 km (95,000 miles) on my engine. If I don't rebuild, they only suggest 5-7 lbs of boost. I would like to rebuild, streetport and use a 12a centerplate I have as well for more flow (perhaps even bridgeport the centerplate). I could use the video and do it myself without lapping unless there is a way to hand lap the plates myself. Any suggestiongs??? (Don't say turbo)

Purchase the 9 inch blower for the 13b not the 7. Don't let them tell you otherwise.

84stock 01-28-2005 03:23 PM
why the 9"

j9fd3s 01-29-2005 12:52 PM
Originally Posted by 84stock' date='Jan 26 2005, 11:40 AM
[attachment=27568:attachment][attachment=27569:attachment][attachment=27570:atta

hment]I have a 13b in my SE and am ordering a cmden 7inch for it (not the efi one). Has anyone done rebuilds without lapping? I only have 140,000 km (95,000 miles) on my engine. If I don't rebuild, they only suggest 5-7 lbs of boost. I would like to rebuild, streetport and use a 12a centerplate I have as well for more flow (perhaps even bridgeport the centerplate). I could use the video and do it myself without lapping unless there is a way to hand lap the plates myself. Any suggestiongs??? (Don't say turbo)



at 95k miles on a gsl-se it should look new in there

chase78 02-13-2005 03:51 AM
Don't lap get a set a used good housings or news ones. the risk of you runing of breaking off the inner water jacket increases and you get rig of the harded finish on the housing and compression and performace is reduced.


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