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Sep 17, 2008 | 05:25 AM

seldon

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From: N/A

Block

hi,
i checked my b18's bore before i install my new pistons and cylinders 2 and 3 are out 6 thou, and cylinders 1 and 4 are right on. i was wondering if 6 thou is enough to worry about cause im using 81 mm pistons.
thanks

Sep 17, 2008 | 05:49 AM

98vtec

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From: Cantonment, FL

Re: Block (seldon)

are you saying your piston to wall is .006?

Sep 17, 2008 | 05:53 AM

seldon

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Re: Block (98vtec)

sorry i'm sayin my cylinder walls are out of round .006, i read a manual that says .006 is the limit, any opinions?

Modified by seldon at 7:13 AM 9/17/2008

Sep 17, 2008 | 06:13 AM

98vtec

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From: Cantonment, FL

Re: Block (seldon)

that is quite large then even on the other 2 cylinders.

cast or forged pistons?

cast should be around .0011-.0015 IIRC

what is the top ring gap?

Sep 17, 2008 | 06:18 AM

seldon

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Re: Block (98vtec)

i worded that really bad lol, i meant the cylinder walls on 2 and 3 are out of round .006, is this safe to go with

Sep 17, 2008 | 08:52 AM

DonF

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From: Atl. Beach, fl, duval

Re: Block (seldon)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by seldon »</TD></TR><TR><TD CLASS="quote">i worded that really bad lol, i meant the cylinder walls on 2 and 3 are out of round .006, is this safe to go with</TD></TR></TABLE> Yes, just keep a case of oil in the trunk.

Sep 17, 2008 | 02:29 PM

seldon

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From: N/A

Re: Block (DonF)

anyone else please, i would appreiate it, also does anyone know the max the block can be out of round, and any more opinions on .006 and whether it will do anything. thanks

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Sep 17, 2008 | 02:53 PM

98vtec

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Joined: Oct 2002

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From: Cantonment, FL

Re: Block (DonF)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF »</TD></TR><TR><TD CLASS="quote"> Yes, just keep a case of oil in the trunk.</TD></TR></TABLE>

lets see if i can decipher this into "younger" more fragile words:

no.

?

Sep 17, 2008 | 02:56 PM

ruffrhyder

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From: Earth

Re: Block (seldon)

Get the block bored .010" or .25mm over and install new pistons and rings.

Sep 17, 2008 | 03:09 PM

#10

98vtec

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From: Cantonment, FL

Re: Block (ruffrhyder)

From h22 FSM:

first measurement (top)
second measurement(middle)
third measurement(bottom)

bore taper limit (difference between top and bottom) = .002"

Sep 17, 2008 | 04:22 PM

#11

seldon

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From: N/A

Re: Block (98vtec)

well shoot, cause i already have brand new 81mm b16 pistons, hmmmm

Sep 17, 2008 | 04:42 PM

#12

projectTeG

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From: jacksonville, fl

Re: Block (seldon)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by seldon »</TD></TR><TR><TD CLASS="quote">well shoot, cause i already have brand new 81mm b16 pistons, hmmmm</TD></TR></TABLE>

hrm. oops. when i built my engine i automatically bought oversized pistons. i figure high milage engine. ovaled walls etc. etc.