Highest compression using the stock starter????????
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Road Captain
Joined: Oct 2007
Posts: 741
Likes: 0
From: Charlotte, NC
Highest compression using the stock starter????????
I'm finally getting my 95" big bore kit installed and need to know what the highest compression I can still run the stock starter? I'm going to be somewhere between 9.5 and 10.25.
I figure there are 2 options if I pass the threshold:
1. Upgrade to a bigger starter. What size?
2. Compression releases installed once the heads are off and at the machine shop. Anyone ever do this?
Thanks.
I figure there are 2 options if I pass the threshold:
1. Upgrade to a bigger starter. What size?
2. Compression releases installed once the heads are off and at the machine shop. Anyone ever do this?
Thanks.
Road Master
Joined: Oct 2009
Posts: 1,178
Likes: 6
From: N.C.
lionm13 hit it dead on the head at 10:1.
Usually a stock starter will start to grunt at anything above 10:1. I have seen stock starters crank engines with much higher compression, however Its all in how the stock starters built, some are just stronger than others.
Usually a stock starter will start to grunt at anything above 10:1. I have seen stock starters crank engines with much higher compression, however Its all in how the stock starters built, some are just stronger than others.
Tourer
Joined: Dec 2007
Posts: 409
Likes: 0
From: Ruffin, North Carolina
I'm in that 10.25 realm and I went with the Harley S/E releases. The starter will crank it up with out using them, BUT, it does't like it one bit. Get the compression releases installed while it's torn down. Hell of a lot cheaper than a new starter.
Tourer
Joined: Aug 2008
Posts: 483
Likes: 7
From: Harrisburg, NC
Definitely have the machinist install compression releases, Goodson has some good ones. I'm at 10.8:1 compression with the original starter and cables, but am bumping that to 11:1 now. Down the road I'm planning on upgrading the starter and just as importantly the cables...
K.
K.
Road Master
Joined: Jan 2007
Posts: 861
Likes: 3
From: trivoli illinois
10:1 is about the limit. stock starter will work at a higher comp. BU NOT FOR LONG. releases are a no-brainer when the heads are off. when its time for a starter go with a better than stock replacement. better cables sure wont hurt either. steve
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