1998 NG Discussion

Avanti Compression Ratio?? All 5 messages in topic - view as tree From: John Poulos - view profile Date: Thurs, May 28 1998 12:00 am Email: John Poulos Groups: alt.autos.studebaker Not yet ratedRating: show options Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse | Find messages by this author

Michael Nope, the R-2 has dished pistons to lower the compression, you can use the thick standard 289 head gaskets to lose about a half point,

hardly worth the effort. I have had no luck with 104 + on my R-1, but I

bought a case of real lead at the flea market and with 94 octane Sunoco

I end up with about 100 real octane and that seems to work fine. You may have to retard the spark 4 to 6 degrees to get it to run on the junk that passes as gasoline today.

Michael Float wrote:

Does using R2 cylinder head gaskets lower the compression ratio on an R1
> Avanti Engine? If so, what all is involved besides putting the new head
> gaskets on? On my 1963 Avanti, with the engine timing set to factory
> specs or changed to 2 degrees adjustment which is where it seems to
> otherwise run and idle the best, it pings like crazy during acceleration.
> I am using Amoco Ultimate Premium and 104 + Octane booster, and it still
> pings real bad. The prestolite dual point was recently rebuilt & I had
> my mechanic set the dwell and points for me using the specs in the shop
> manual. Thanks.

-- John Poulos

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From: NELSON BOVE - view profile Date: Thurs, May 28 1998 12:00 am Email: NELSON BOVE Groups: alt.autos.studebaker Not yet ratedRating: show options Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse | Find messages by this author

Michael Float wrote:

Does using R2 cylinder head gaskets lower the compression ratio on an R1
> Avanti Engine? If so, what all is involved besides putting the new head
> gaskets on? On my 1963 Avanti, with the engine timing set to factory
> specs or changed to 2 degrees adjustment which is where it seems to
> otherwise run and idle the best, it pings like crazy during acceleration.
> I am using Amoco Ultimate Premium and 104 + Octane booster, and it still
> pings real bad. The prestolite dual point was recently rebuilt & I had
> my mechanic set the dwell and points for me using the specs in the shop
> manual. Thanks.

The R2 actually uses the same piston as the R1,the head itself has a larger combustion chamber on the R2. Try setting your timing for full advance with the engine at around 3000-3400 rpm and vacuum advance disconnected. I don't remember the exact spec but I think it was

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From: John Poulos - view profile Date: Thurs, May 28 1998 12:00 am Email: John Poulos Groups: alt.autos.studebaker Not yet ratedRating: show options Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse | Find messages by this author

Nelson I stand corrected the standard 289 used the dished pistons and all R-1 and R-2's used the same flat top piston. My confusion came from the

pistons in my last R-1, they were the new "Avanti style" slipper pistons with a dish to run on todays fuel. If you could find a set of R-2 heads

you'd end up with a 9 to 1 R-1 engine.

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NELS> Michael Float wrote:

> Does using R2 cylinder head gaskets lower the compression ratio on an R1
> > Avanti Engine? If so, what all is involved besides putting the new head
> > gaskets on? On my 1963 Avanti, with the engine timing set to factory
> > specs or changed to 2 degrees adjustment which is where it seems to
> > otherwise run and idle the best, it pings like crazy during acceleration.
> > I am using Amoco Ultimate Premium and 104 + Octane booster, and it still
> > pings real bad. The prestolite dual point was recently rebuilt & I had
> > my mechanic set the dwell and points for me using the specs in the shop
> > manual. Thanks.
> The R2 actually uses the same piston as the R1,the head itself has a
> larger combustion chamber on the R2. Try setting your timing for full
> advance with the engine at around 3000-3400 rpm and vacuum advance
> disconnected. I don't remember the exact spec but I think it was
> 34degees?? Also the Prestolite distributors are notorious for wearing
> out advance wts. Were these replaced during the rebuild?

-- John Poulos

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From: Michael Float - view profile Date: Fri, May 29 1998 12:00 am Email: snipped-for-privacy@prodigy.com (Michael Float) Groups: alt.autos.studebaker Not yet ratedRating: show options Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse | Find messages by this author

Does using R2 cylinder head gaskets lower the compression ratio on an R1 Avanti Engine? If so, what all is involved besides putting the new head gaskets on? On my 1963 Avanti, with the engine timing set to factory specs or changed to 2 degrees adjustment which is where it seems to otherwise run and idle the best, it pings like crazy during acceleration. I am using Amoco Ultimate Premium and 104 + Octane booster, and it still pings real bad. The prestolite dual point was recently rebuilt & I had

my mechanic set the dwell and points for me using the specs in the shop

manual. Thanks.

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From: Bob Kapteyn - view profile Date: Sat, May 30 1998 12:00 am Email: snipped-for-privacy@mcs.com (Bob Kapteyn) Groups: alt.autos.studebaker Not yet ratedRating: show options Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse | Find messages by this author

Nelson
> I stand corrected the standard 289 used the dished pistons and all
> R-1 and R-2's used the same flat top piston.

Reply: We sell flat top pistons that are cut down to lower the compression. Joliet Studebaker Service. 112 Bissel Street Joliet IL. 60532 tel # 815 726 1531.

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