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Big Block Talk! Everything about swapping a big block engine into your cart! |
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12-29-2015, 08:07 AM | #1 |
Just one day at a time
Join Date: Sep 2009
Location: South TX
Posts: 8,650
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18HP Briggs
Ok, you all know that I have this motor in my cart. Here is what has been done to it so far.
High performance cam Billit rods advanced timing key high rev kit two barrel conversion copper gaskets Now on that note, a while back a member gave me a set of 16HP heads with aluminum rockers. I have read it seems that I would need to run premium gas on this setup but I would like some opinions on this setup and if there would be any concerns in regards to this? Currently the backlash on is set at .004 and .006, would this remain if the 16hp heads were installed as well? |
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12-29-2015, 08:49 AM | #2 | |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: 18HP Briggs
Quote:
Depending on the cam, you may have to get creative with the valve adjusters. I run .004" on both valves. |
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12-29-2015, 08:55 AM | #3 |
Just one day at a time
Join Date: Sep 2009
Location: South TX
Posts: 8,650
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Re: 18HP Briggs
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12-29-2015, 09:29 AM | #4 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: 18HP Briggs
There is room.
If you look at Boke's build thread, you'll see what I did with the adjusters. It depends on the cam grind. |
12-29-2015, 10:48 AM | #5 |
Just one day at a time
Join Date: Sep 2009
Location: South TX
Posts: 8,650
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Re: 18HP Briggs
The lope on the cam is right at .300.
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12-29-2015, 01:44 PM | #6 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: 18HP Briggs
It's not so much the amount of lift that causes the issue.
It's how the cam is ground to achieve the lift that causes the issue. You can grind a cam with the same base circle as a stock cam, but that will only allow a certain amount of lift until interferences occur. To get around the interference issue, a cam is given more lift by reducing the base circle diameter. What this can cause is that the pushrods(while on the low side of the cam) are not long enough to reach the adjusters in the stock configuration. |
12-29-2015, 01:51 PM | #7 |
Gone Wild
Join Date: Jun 2014
Location: San Diego,CA
Posts: 622
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Re: 18HP Briggs
Nice rockers!!! Are the 16hp heads hard to come by?
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12-29-2015, 01:57 PM | #8 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: 18HP Briggs
16hp heads are easy to find.
16hp heads with aluminum rockers are harder to find. |
12-29-2015, 09:25 PM | #9 | |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,647
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Re: 18HP Briggs
Quote:
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12-29-2015, 09:29 PM | #10 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: 18HP Briggs
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