09-15-2013, 08:20 PM #1
The MR-1 Supercharger idea again...
I know RIVA had a turbo kit for these MR-1 engines at one point. So this is going back on anyone's memories that actually reads my posts...
Did they require new internals?
If so, what did they lower compression to?
What boost numbers did they run and how much power?
Anyone ever try it with a simple double head gasket approach or with opening up the heads via dremel?
Here's the thing....
I have the boat with two mr-1 engines. I am tired of throwing money at it trying to get to 60 mph. I love the boat, just want some more speed outta it.
Thinking of supercharging it. Here's why I think that's the way it needs to be:
1. The intake and exhaust are too large of volume to actually get a decent velocity of air through the system. The 1 liter engine just can't process it fast enough to make the intake and exhaust within reason. They are designed (according to my calculations, which are still missing exact cam specs) to have this engine spin 14k... which is the motorcycle rpm!!!!
2. Adding velocity stacks, removing the filter, replacing the exhaust with straight through did NOTHING in regards to top speed or rpms.
3. The boost, even SLIGHT boost will fill the intake with air causing this motor to act like it's at 14k N/A. So I'm talking like 5 psi or less as I really only need it at top end.
4. There are several car superchargers (Cobalt ss) that have 200 hp motors. I believe a simple pulley off of the shaft (7k rpm) would create the boost needed and give this 160 hp engine 200 hp.
5. I have dealt with 600 hp mustang 5.0 engines before, and am not scared of boost, but they usually don't start with 12.5:1 compression....
Thanks for any info you guys may have.
PS. would one of those engine tuners be a better spend of money?
Last edited by Speedling; 09-15-2013 at 09:08 PM. Reason: details...
09-15-2013, 10:03 PM #2
Don't do it. Wasn't a successful conversion that had a kaboom tendency. You're better off trying to install 2 1800cc HO engines with electronics in the long run or just upgrade boats.
09-15-2013, 10:12 PM #3
I'm guessing the internals need to be upgraded pretty well in order for it to be worth the boost.
Any ideas on the Power commander or Powershot?
I don't know what they actually do vs each other but I'm hitting 52 right now, and i'm just trying to get close to 60. The brand new boats have the 1.8's and can do 54...
I would love to buy the 1.8svho, but don't have that type of money.
09-15-2013, 10:24 PM #4
I think the MR-1 is more like 140 hp as the 1812's are 180 hp
Powershot wont help unless you need more fueling, which they arent a safe way to add fuel, because if they fail you go LEAN....
09-15-2013, 10:25 PM #5
09-16-2013, 08:43 AM #6
By the time you sink many K's into it. You'd be better off buying a SHO powered ski. Like the saying goes.. There's no replacement for displacement.
09-16-2013, 08:08 PM #7
He has a boat I believe and that's why I said a NA 1800cc HO engine as can most likely find the conversion easier since no boat comes with SHOs stock.
09-17-2013, 04:55 AM #8
As someone already said the supercharger conversion was not that great
It brought the 160ho to close to 210 hp
And was rumoured to be close to 70 mph so compared to the stock 58 mph it was quite a gain
But at the time it was $10k for the kit
And if I remember correct they only made 25
And I only remember seeing one person posting about having one
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