do you think i could run a pair of rude 200s on an 18ft manta?

[ratman]

i bought a pair of 99 rude 200s with al rigging and 153 hours for 5k last week, looking for something intersting to put them on. i came across an clean 1980 18ft manta that has a 1980 merc 140 on it... the boat has a notched transom for the o/b, i was thinking i could fabricate a transom bracket to hold my twin 200s. this looks like a splash of a dinzi 18, which came with a sb chevy and volve 280, which i figure weigh about the same as a pair of 200s... pls let me know what you think, thx, rm

[FUJIMO]

Entirely too much hardware for that little boat, for about a dozen different reasons.

[ratman67]

Entirely too much hardware for that little boat, for about a dozen different reasons.

please elaborate... it looks like a donzi 18 splash. they come with 300hp sb chevys and a volvo 280 out drive. i know of a guy with about a 1000 ponies in an 18ft donzi with an arneson surface drive... why is twin 200s too much? the weight? i would think twins go straight on re entry after catching some air, i know a guy running 780hp single i/o and it gets squirly when there is not much boat in the water. please explain your thinking...thx, rm

[JohnR]

Not just the amount of weight, the location of it. The car motah is inside the boat, the outboards are hanging off the back.

[donmac]

rigging a twin doesn't put the props and drives in the optimal spot for performance. it would only be better if a single engine of sufficient hp wasn't available,and it certainly is these days. a single 250hp would likely be as fast and handle superior on an 18' hull! I have a 21challenger with twin 225 2.4's and it's at it's limit for stern weight with the jackplate! I just couldn't see an 18' hull handling it without landing vertical and tripping after a wave launch!what is the beam on your hull,I thought the Donzi was built narrower than the challenger,so displacement may be reduced considerably!

[mariawhitetrash]

You can't compare a single inboard with a sterndrive to twin outboards. One word - Balance!

[ratman67]

rigging a twin doesn't put the props and drives in the optimal spot for performance. it would only be better if a single engine of sufficient hp wasn't available,and it certainly is these days. a single 250hp would likely be as fast and handle superior on an 18' hull! I have a 21challenger with twin 225 2.4's and it's at it's limit for stern weight with the jackplate! I just couldn't see an 18' hull handling it without landing vertical and tripping after a wave launch!what is the beam on your hull,I thought the Donzi was built narrower than the challenger,so displacement may be reduced considerably!

i think its a 7' beam...

[ratman67]

i have the pair of rude 200s is the only reason i was contemplating this, that and the fact the boat has a 140 merc inline on it... my buddy is giving me a real low hour 225 rude for it...so that's the ticket providing i can work a deal on it...

thx for your replies, rm

[83PREDICTOR]

I say do it. If its no good then just take one off.

[FUJIMO]

35 year old saltwater boat? I'm sure it will be fine...

[ratman67]

35 year old saltwater boat? I'm sure it will be fine...

who runs 24* hulls on a lake? i had a 79 cig mistress with zero rot in the stringers or transom... i hear some of the i/o donzis of which the manta is a splash had transom rot issues, the outboard boats didn't...rm

[1BadAction]

Call filter and see how he did. http://www.screamandfly.com/showthre...o-Hydro-Valero

I say do it, fux what everyone else says. The best that could happen is it runs like a scalded ass dog and scares the **** out of you. The worst that could happen is it handles like ass and you have a spare engine to sell. Not like twins on a little boat is anything new, Frostman and RRevinrude were doing it when many of us were still chittin yellow.

[FUJIMO]

who runs 24* hulls on a lake?...rm

Who runs a 24 degree V-bottom on a lake? I guess that would depend on the size of the lake...right?

[ratman67]

my bad, should have said who runs flat bottoms in the ocean. lol most 24* offshore hulls actually are run in the salt...rm

[Quinten]

Call filter and see how he did. http://www.screamandfly.com/showthre...o-Hydro-Valero

I say do it, fux what everyone else says. The best that could happen is it runs like a scalded ass dog and scares the **** out of you. The worst that could happen is it handles like ass and you have a spare engine to sell. Not like twins on a little boat is anything new, Frostman and RRevinrude were doing it when many of us were still chittin yellow.

Man, that is cool! Does look a little stern heavy from the still shot. Do you know if those were 2.0 or 2.4?