Forum: Overhaul
03-27-2020, 05:41 PM
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Replies: 7
Views: 2,497
My cam and lifters had rust damage from a...
My cam and lifters had rust damage from a hurricane flood into a garage where the freshly rebuilt motor was on the floor.
Anyway, I took each lifter and hand lapped it on a diamond stone.
They have...
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Forum: Polls
03-18-2020, 08:45 PM
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Replies: 21
Views: 9,517
not a displacement hull comparison
As to rpms and head gaskets:
I am only using one head gasket, and last outing turning 3600rpm direct drive.
In my tuning process in my planning hull, I got an increase in rpms with headgasket...
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Forum: General Interest
02-22-2020, 07:34 PM
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Replies: 154
Views: 74,980
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Forum: General Interest
02-22-2020, 07:00 PM
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Replies: 154
Views: 74,980
Kinda thinking of building a light version of...
Kinda thinking of building a light version of this boat,
just to see how much more speed I can get from it.
Or build a Maryland "dovetail" or also called draketail to put the atomic in.
Long and...
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Forum: General Interest
02-16-2020, 03:03 PM
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Replies: 154
Views: 74,980
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Forum: Troubleshooting
07-10-2018, 06:55 PM
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Replies: 13
Views: 7,288
Worn Exhaust valve stems& guides also lets...
Worn Exhaust valve stems& guides also lets pressure into the crankcase.
I replaced mine with stock- snug fit-(not reamed) guides,and noticed
less blow from the oil fill cap.
I already have great...
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Forum: Fuel System
12-30-2016, 07:47 AM
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Replies: 40
Views: 15,707
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Forum: Electrical
03-28-2016, 02:26 PM
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Replies: 33
Views: 11,225
Nothing to do with the alternator
Wow, I let my boat warm-up about 5+ minutes then go put her up on plane....:o With RWC I never warm-up above 100 unless under hard load..
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Forum: General Interest
03-21-2016, 09:36 PM
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Replies: 12
Views: 6,110
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Forum: General Interest
03-20-2016, 03:08 PM
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Replies: 12
Views: 6,110
Yes they have tried roller cams. But due to the...
Yes they have tried roller cams. But due to the smallness of our set-up they had to actually place the roller on the tip of the cam lobe. So you didn't get the full effect of a "roller" profile cam...
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Forum: General Interest
03-19-2016, 09:44 PM
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Replies: 12
Views: 6,110
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Forum: General Interest
03-19-2016, 04:15 PM
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Replies: 12
Views: 6,110
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Forum: General Interest
03-19-2016, 04:06 PM
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Replies: 12
Views: 6,110
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Forum: General Interest
03-19-2016, 03:54 PM
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Replies: 12
Views: 6,110
Notice the twin sparkplugs .
That was a stock...
Notice the twin sparkplugs .
That was a stock head I welded up the original hole and then relocated. The coil was from a twin cylinder 18HP Briggs
I also welded a intake on a angle for better...
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Forum: General Interest
03-19-2016, 03:49 PM
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Replies: 12
Views: 6,110
Modified flathead
I used to race karts and we used a Briggs & Stratton 5hp flathead
12 Cubic inch the bore and valve sizes are almost exact of a Atomic.
But the Briggs had about 5/8" less stroke.
In full modified...
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Forum: Fuel System
03-19-2016, 02:57 PM
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Replies: 23
Views: 5,591
Yes, I have a 19ft. wooden v bottom planning...
Yes, I have a 19ft. wooden v bottom planning hull.
One head gasket, multi angle valve seats, deburred ports mobil one motorcycle oil .
I also run my valve guides as tight as possible for better...
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Forum: Fuel System
03-19-2016, 01:55 PM
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Replies: 23
Views: 5,591
On the exhaust thing.
I still only have 1 1/4"...
On the exhaust thing.
I still only have 1 1/4" exhaust and now am turning 3,600 rpm.
No signs of restriction.
Many a V8 car came with single 2 inch exhaust in the 60's-70's-80's
Making at least...
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Forum: General Interest
11-10-2015, 03:04 PM
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Replies: 154
Views: 74,980
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Forum: General Interest
11-09-2015, 04:59 PM
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Replies: 154
Views: 74,980
Well I tried the Mobil synthetic motorcycle...
Well I tried the Mobil synthetic motorcycle racing oil.
I was running Shell Rotella.
It runs 5-10 degrees cooler.
And I picked up a precious few more RPMS :D (around +50 )
I am now faster than...
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Forum: For Sale - Engines and Engine Parts
09-10-2015, 04:19 PM
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Replies: 13
Views: 5,042
I've thought about a purpose performance boat...
I've thought about a purpose performance boat build, just for our little engine.
Just to see how fast I can make the "atomic" go..
But it is also so easy to take all that money, and just buy...
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Forum: For Sale - Engines and Engine Parts
09-10-2015, 02:16 PM
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Replies: 13
Views: 5,042
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Forum: Exhaust System
03-30-2015, 12:34 PM
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Replies: 57
Views: 20,615
I made mine from brass-bronze pipe, and it was...
I made mine from brass-bronze pipe, and it was always coming loose at the manifold threads.
Then,, I believe the second year it feel apart.
Under the wrap it was just scaled apart and looked like...
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Forum: General Interest
03-27-2015, 08:06 PM
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Replies: 21
Views: 6,724
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Forum: General Interest
01-28-2015, 08:03 PM
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Replies: 21
Views: 6,724
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Forum: Troubleshooting
11-09-2014, 01:56 PM
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Replies: 34
Views: 10,017
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