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Thread: Yamaha 130 V4 Project Build.
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09-21-2014, 08:16 PM #1066
This new prop really hooks up hard. Last time 94mph was at 7100rpm which was 13% slip. This prop ran almost the same at 8%. I could probably come up a 1/4" and run 95 right now but Im going to talk to Tim at Performance first. He wanted to cut the blade area down but leave the diameter to reduce the crabbing and tail lift.
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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09-21-2014, 08:57 PM #1067
Slip is a theoretical number.... The new prop is a closer to 34 or your tach is off. The numbers hammered on the side of the prop do not tell the whole story
Either way that boat is very efficient, 99% of 200hp tunnels have trouble going that fast at that RPM with a 1.87. Doing it with a 2:1 is proof that thing is dialed in.Last edited by baja200merk; 09-21-2014 at 09:00 PM.
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09-21-2014, 10:08 PM #1068
I had the prop checked by Rich Junker before I ran it. Its a 32 but it has very little progression. Most 32's are 30 at the leading edge, 32 in the middle, and 34 at trailing edge. He said this one is closer to 32 throughout the blade. Thats usually is fast and very efficient with poor holesshot which is exactly how it ran.
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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09-21-2014, 10:11 PM #1069
Little video of Dago strolling by today cruising across the harbor. I was probably only running about 60. I swear the motor sounds different with each prop I run. A lot of the unique sound of his thing is the prop. Kind of a howl and it seems to change pitch with ..... pitch!
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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09-21-2014, 10:21 PM #1070
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09-21-2014, 10:32 PM #1071
Im saying 93mph was pretty damn fast.....but I really want that 95
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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09-21-2014, 10:39 PM #1072
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09-21-2014, 10:45 PM #1073
Would have to change gears and I might have them here. I tried a 34. Wayyy to much pitch and it didnt like it. Tried to paddle wheel that back of the boat around to the front at 90+
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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09-22-2014, 05:32 AM #1074
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10-07-2014, 01:12 PM #1075
Anyone know what the stock 115/130 compression numbers were? I know the 115 had the goofy head with different compression top and bottom. I took .050 off a stock set of 115 heads and need to take a little more to get my numbers back up. I still have .070 of squish and need about 10-15 more psi.
I want to say my stock 130 had 130+ psi which seems high but googling it I get similar numbers.13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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10-12-2014, 04:43 PM #1076
Finally tried something I have been meaning to do.
Made a wide open pass with my slow prop at 85.1. That prop always run 85 and never faster.
Took off the velocity stacks and it went 86.5.
Ray had told me to try without and I keep meaning to do it but just never did. This was back to back same load, water, weather etc.
That should get me 95+ with the big prop.
For sale: One set of Kottman velocity stacks13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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10-12-2014, 05:32 PM #1077
Mr. D Any idea why she runs faster without the v-stacks? 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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10-12-2014, 05:38 PM #1078
Chris, can you determine how close the stacks are to the cowl? Do you have at least 1½"
Regards,
Charlie North
If it ain't broke, modify it.
80 21' Superboat with Yamaha 225 Excel power
76 Glastron to be powered by a 6.2 L92 with surface drive
87 Glastron CVX20 Hull
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10-12-2014, 06:24 PM #1079
Plenty of room but could be a number of things. My carbs are modified quite a bit with a "smooth bore" that is almost like a VS so maybe it was like a really long VS. I had rounded the edges of the carbs themselves when I modded them and then Ray sent me the stacks so I bolted them up. I knew there might be a slight difference but it was pretty big.
You just never know what a motor will like.13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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10-12-2014, 06:32 PM #1080
It felt better from idle up but its hard to tell seat of the pants.
13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax