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Thread: 85hp V4 Mod begins
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11-21-2017, 10:51 AM #91
Yeah i know a dremel lol. I was looking on CC Speciality tools youtube channel about chamfering the ports. They say about .5mm
Iam like a sponge soaking up all i can about doing this mod. Really looking forward to it.
Hopefully if i can get all the pictures up it may encourage others to take it on as well.
If not at least it will be a good read
Andy
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11-21-2017, 10:59 AM #92
your just rounding the edge of the port so its not sharp is all,less chance of catching a ring.
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11-21-2017, 11:06 AM #93
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11-21-2017, 11:55 AM #94
So that covers the porting side of things
Next Honing what is best for the DIYer ie me
3 stones spring loaded https://www.ebay.co.uk/itm/Cylinder-...0AAOSwxbtZmvwj
Or Flex Ball http://www.ebay.co.uk/itm/3-1-2-Cyli...YDYD8zf5dCpnSw
Bear in mind my bore is 3 1/2" ie 88.9mm the flex ball does 89mm
Which is best to use its only de-glazing
What grit should i be looking at 240 ?Last edited by spybot; 11-21-2017 at 11:59 AM.
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11-21-2017, 01:45 PM #95Member
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spybot glad to see your getting the info your needing . I have been watching this thread and holding off replying because I am going from memory from 15+ yrs ago . Anyways helped a buddy do what your doing to his 85 Johnny , early 80's but think it was prop rated . Can't remember for sure what we did to the ex. ports but he did get the 140 deflector and bubble back . On the intakes I do remember they were 5/8" round and I put the block in my mill and used a 5/8 slot drill to square the port moving the cutter 1/16" each way wider and 1/16" up to the deck . This made a nice 11/16" x 3/4" rect. port with 5/16" radius corners . I Cut the heads .030" to raise compression to make up for raised port and he got some carbs from a newer (I think 120) they were plastic bodies . Motor ran real nice when done more power everywhere , made for excellent 16' ski runabout power . Hope that helps good luck with your project .
Rick1978 21' Campion Skeena 235 Mercruiser
2007 21' Keelowcraft Challenger 350 SBC
1991 19' STV Pro Comp ski 2.4 Bp EFI
1991 18' Lee Craft Tunnel 2.4 Bp carb
12' Valco Honda 10
the honda runs
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11-21-2017, 04:53 PM #96Scream And Fly VIP
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You need a rigid hone to properly hone the block. When you chamfer the ports it is not just the top side.
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11-21-2017, 05:07 PM #97
Rick thanks for the support
hope you are enjoying the thread. You have answered my next question the width of the ports.
This build should take hopefully get done before the start of the year. Getting all done by myself (fingers crossed) I need all the help i can get from you guys that have been round the V4s for years. You will have forgotten more than i know about them.
Andy
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11-21-2017, 05:10 PM #98
Andy you can check out youtube for porting videos (try 2 stroke cylinder porting) . Keep us updated with pics as you will get help and hints thru the project.
Gary"12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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11-21-2017, 05:13 PM #99
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11-21-2017, 05:16 PM #100
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11-21-2017, 05:45 PM #101Member
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negative on the dingle berry hone being rigid . A sunnen AN-110 is a suitable hone . A engine shop could do that for you . It only needs a couple strokes with 280 stones and it will show the cyl. wear . Might be the way to go and they can see if it needs to be bored. Are your in. ports 5/8 round ? What are the ex. ? might help refresh my memory .
Rick1978 21' Campion Skeena 235 Mercruiser
2007 21' Keelowcraft Challenger 350 SBC
1991 19' STV Pro Comp ski 2.4 Bp EFI
1991 18' Lee Craft Tunnel 2.4 Bp carb
12' Valco Honda 10
the honda runs
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11-21-2017, 06:43 PM #102
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11-21-2017, 06:51 PM #103Member
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roger that, sweet v4 porting dreams lol .
1978 21' Campion Skeena 235 Mercruiser
2007 21' Keelowcraft Challenger 350 SBC
1991 19' STV Pro Comp ski 2.4 Bp EFI
1991 18' Lee Craft Tunnel 2.4 Bp carb
12' Valco Honda 10
the honda runs
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olboatman liked this post
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11-22-2017, 12:30 PM #104Member
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spybot I have some corrections to post 96 . I talked to my buddy last night and he thinks the motor was an 1982 and it was a 90 not an 85 . He couldn't remember the porting , and I started to wonder after I posted if it wasn't the ex. ports that started as 5/8 round . I think I raised both in. and ex. by 1/16 and widened 1/16 each way for a total of 1/8 wider . It would be safer to not raise the ports and just widen and increase area and not change the height (timing) as the others have said . Sorry for any confusion .
Rick1978 21' Campion Skeena 235 Mercruiser
2007 21' Keelowcraft Challenger 350 SBC
1991 19' STV Pro Comp ski 2.4 Bp EFI
1991 18' Lee Craft Tunnel 2.4 Bp carb
12' Valco Honda 10
the honda runs
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11-22-2017, 12:50 PM #105Screaming And Flying!
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