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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   Build a 650-700 hp engine. N/A or blower? (https://www.offshoreonly.com/forums/general-boating-discussion/334652-build-650-700-hp-engine-n-blower.html)

jeff32 02-24-2016 08:12 PM
Originally Posted by caseyh (Post 4407910)
Top end is norma and bottom end Ron is saying 400 and hopefully more. They are big but very low cop to run 87. Dart tall decks, alm pro 1 heads, all ported, fully roller etc. http://i902.photobucket.com/albums/a...psflymmdsr.jpg
thats a nice looking clean engine bay!!!

caseyh 02-24-2016 09:30 PM
Originally Posted by ROB FREEMAN (Post 4408136)
going to be tight fit .. that hatch arm looks like it might hit when closing on the tails clamp ...mine was hairline close on my cig .. yours looks to be the same .. looks sweet enjoy, raised port heads n talldecks make for a wide package been there done that .. my headers had to be " leaned " as cmi calls it .

The hatch didn't shut. Had to put the oval cut outs and yes the arm was very tight fit. Always something lol

caseyh 02-24-2016 10:02 PM
Originally Posted by 33outlawsst (Post 4408060)
Your bilge looks like a operating room, nice looking mils, whats up with the collar on the header flange......whats the bullet weigh ??
Thanks need some rigging will still be very clean. Very happy with the motors and build on them. The flanges are for clamps to hold the tails on. cigarette says 8,700, I say more. http://i902.photobucket.com/albums/a...psxyvtknlb.jpg

phragle 02-24-2016 10:20 PM
I love the street sign.....

SS930 03-02-2016 08:13 AM
Originally Posted by I.C.U.Lookin (Post 4405019)
Blown 540. Reason being is set the bottom end up right. Keep compression low and it becomes easier to add boost for speed later if you really wanted. Build it N/A and your compression will likely be higher so you have to be more careful adding boost when it isn't fast enough and let's be honest. It's never fast enough. Lol
I agree with the thought of building a 540ci (or larger) with a decent forged bottom end that can handle some boost. Build it with lower CR and run a thinner HG to raise the CR back up some and it can be used NA, put a fatter HG in there and you can drop it down and run boost. Running NA you can meet the goal of this exercise, WHEN you get have the funds and get itchy for more power, just change the HG and add the blowers and you're all set to make some bigger numbers.

Jupiter Sunsation 03-02-2016 09:07 AM
Originally Posted by tommymonza (Post 4404980)
Mike what is the best route to take to build a motor to get the most power and reliability for the least amount of money?smaller cubes with less exotic parts with a blower or big cubes winding to the moon?
I'd just call Cobra Power.......best used parts money can buy! :evilb:

tommymonza 03-02-2016 09:47 AM
The goal was 650 horse right. If you can get there with a 420 Merc with a decent size blower , would some Afr heads be overkill for the bottom end ?

Full Force 03-02-2016 08:41 PM
A buddy did small cam upgrade and 5 psi prochargers on his 420's made 716 on dyno 5800 rpm. good gains!!

Originally Posted by tommymonza (Post 4410541)
The goal was 650 horse right. If you can get there with a 420 Merc with a decent size blower , would some Afr heads be overkill for the bottom end ?

tommymonza 03-05-2016 04:06 AM
Originally Posted by Full Force (Post 4410852)
A buddy did small cam upgrade and 5 psi prochargers on his 420's made 716 on dyno 5800 rpm. good gains!!
The question would be than , how long will that combination Live?

Full Force 03-05-2016 07:23 AM
Until it breaks, with safer tune was 680 hp, should be fine for a while...


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