10:1 pistons with an A cam?

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Swede
Posts: 9
Joined: Sat Mar 24, 2007 3:02 pm
Location: Malmo, Sweden

10:1 pistons with an A cam?

#1

Post by Swede » Sun Mar 25, 2007 2:43 am

Hi everybody, I searched earlier topics, but I could not find the info I need, and I hope you guys can help me. I am rebuilding my 1958 Panhead and I just put on a pair of STD heads and I will also put in a new cam and new pistons. Now to my question:
- Can I run an Andrews A grind with 10:1 pistons or will the static pressure be a problem? Has anybody here tried it?

I will run it on 98 octane and I have double plug heads, which I think would allow me to run a not to aggressive timing, thus enabling the setup. Any thoughts?

Thanks in advance,
Nick
Malmo, Sweden



Panacea
Posts: 1827
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

#2

Post by Panacea » Sun Mar 25, 2007 2:49 am

Swede, I had 10:1 Wisco pistons with an A grind in my 49 with no static comp problems. Make sure to let her warm up completly before twistin' the wick with forged pistons though, or it won't last..Mike

Swede
Posts: 9
Joined: Sat Mar 24, 2007 3:02 pm
Location: Malmo, Sweden

#3

Post by Swede » Sun Mar 25, 2007 2:56 am

Thanks for you prompt reply Panacea. I am considering cast pistons due to less expansion when heating up. Does anybody have any thoughts on the subject?

Panacea
Posts: 1827
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

#4

Post by Panacea » Sun Mar 25, 2007 3:00 am

I learned the hard way......go with cast! Mike

Swede
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Joined: Sat Mar 24, 2007 3:02 pm
Location: Malmo, Sweden

#5

Post by Swede » Sun Mar 25, 2007 3:02 am

What went wrong with your forged pistons, Panacea?

Panacea
Posts: 1827
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

#6

Post by Panacea » Sun Mar 25, 2007 3:18 am

Like you suspected, forged pistons grow faster than the cast cylinders during warm up, which in itself would not be a big problem if you let it warm up slowly. But when you ocasionally ride with evos, they care less about such things. So the inevitable happens, jump on,kick twice,keep up....Or don't let them rush you! Mike

Swede
Posts: 9
Joined: Sat Mar 24, 2007 3:02 pm
Location: Malmo, Sweden

#7

Post by Swede » Sun Mar 25, 2007 3:22 am

Thanks, Mike.

Jack_Hester
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#8

Post by Jack_Hester » Mon Mar 26, 2007 1:08 am

Posted a reply, over on the other Pan forum.

Jack

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