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Santa stopped by early

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Trevor Jessie

Trevor Jessie

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I'm looking forward to doing this build. I just need to get a few more things and I think I'll be ready to start. This is going to be the motor for the supercharger.
 

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You really have been a good boy this year haven't you! I'm sure you deserve every last item, Merry Spridget Christmas!
 
Trevor Jessie said:
This is going to be the motor for the supercharger.
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What pistons are you using? You hear me praise the AE 21253 pistons all the time, but this is not the piston you want to use for a blower, they have a higher compression height, and will put the CR in the 9.5 to 1 area, so for a S/C application you're better off using the standard AE 21251 with the lower compression height and a CR of about 8.5 to 1. Blowers don't like alot of compression ratio, 8.0 to 1 would be ideal, 8.5 to 1 will work. We do custom 8.0 to 1 JE piston for the MGBs when using a SC.
 

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I ordered a custom JE that will put my CR at 8.2:1 (if our math is correct). It is only .010 over bore.
 
Hap, that piston is too preaty to go inside a dirty old engine.

Trevor, looks like a fun couple of months.
 
It is a long weekend project... If I could find an empty long weekend. sigh...
 
Wonders what those AE 21253 pistons cost. Round number fine.
 
bpnorthwest.com sells them and an "equivalent" I think. The one in Hap's picture is a JE unit for an MGB. I can show you a picture of my JE piston and tell you the cost, but the story doesn't have a happy ending. :wink:
 
Not a happy ending Trevor. Now I got to ask..........
 
When the wife sees the bill...
 
jlaird said:
Wonders what those AE 21253 pistons cost. Round number fine.
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The last set I bought were $340 with pins and cast iron rings.
 
Hmm, just a bit more than twice standard pistons.
 
Sometimes a man needs to be a man. Be sure to hide future bills.
 
All joking aside, my wife wouldn't never get upset about what I spend on my hobby as long as we are financially sound (I just feel guilty sometimes). She trusts that I wouldn't not spend the money unless we had the discretionary funds. And... it is amazing what she can spend on bicycles and equipment.
 
Trevor Jessie said:
bpnorthwest.com sells them and an "equivalent" I think. The one in Hap's picture is a JE unit for an MGB. I can show you a picture of my JE piston and tell you the cost, but the story doesn't have a happy ending. :wink:
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I'd be interested in hearing what you paid for your JE piston, and what ring stack you used. I design my SC MGB piston to use a Total Seal gapless 2nd ring set.
 
Aren't "discretionary funds" what you give to your "other" wife??! :laugh:
 
I'll go dig out the ticket later. I thought about the total seal gap-less ring, but the machinist talked me out of it since the motor will be running such low boost as compared to a turbo. (I really do not know much about them, I only asked him about them because someone else mentioned it to me) What are your thoughts on the matter?
 
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