Raylar Results
 

Boat PERFORMANCE 707 (made in Italy)

Engine : Volvo 8,1 l 375 HP Duoprop

Speed : 57 MPH @ 4400 RPM

add Raylar BCK 103 Kit and Basset Headers (modified with Corsa quick and quiet)

Result :
67 MPH at 5200 RPM hitting Rev Limiter

Speed on Livorsi GPS Speedo

we will try again with a bigger set of props

Re: Raylar Results
 

some more fotos

Re: Raylar Results
 

some more

Re: Raylar Results
 

Ray, your 496 products are incredible, we are looking forward to a set on our 496's for the new cat, jim loto

Re: Raylar Results
 

Wow, can't deny those results! More prop and it sounds like you'll net more speed. !

Re: Raylar Results
 

those results sound great, but i wonder what the boat would have run if it was propped right from the beginning. 4400 is WAY underpropped

Re: Raylar Results
 

recomended RPM for a 375 HP Volvo is 4600
due to full fuel tank and three persons on board
just 200 RPM below this is o.k.

there are also not so many props available for the Volvo Duoprop compared to Mercruiser Bravo 1 - so getting exactly to the right RPM is a little more difficult

Re: Raylar Results
 

Nice to see your kits work w/ the Volvo line.
Which HP kit is Raylar BCK 103 Kit?

Re: Raylar Results
 

Alfred:

As usual my Awesome German Dealer comes through with another winner! I heard your customer is so happy he calls you almost every day now just to talk about the boat. I am excited to see what the final result is with a little more prop tweaking! Can't wait until your Donzi dealer in Holland gets his new Raylar HO600 motor in a week or so, that should be very exciting too! I am trying to attach the new 496MAG (before) and the HO600 (after) pictures that will be on the website next week. I will mail you a disk in any event.
Again, congratulations to you and your customer on a beautiful job and great results.

Best Regards,

Ray @ Raylar

Re: Raylar Results
 

shows you how much i know about volvos... :o

once again...great work.

Re: Raylar Results
 

Very very impressive gains !! :D :D

Raylar is definitly on the right track with the 496's

Just switch the Basett headers to CMI's and you might be looking to another 3 to 4 MPH gain when right prop pitch has been found :D :D

Re: Raylar Results
 

Just to interject here again. The Bassett headers are good headers. In our testing we only saw about 10 to 15HP more with the CMI sport tubes, so unless 10-15HP is magic, I don't think you will see 3-4 mph using CMI's over the Bassetts. Don't get me wrong here the CMI's are great headers and we have seen about 565HP on our 525HP motors with CMI's kit and about 550Hp with the Bassetts. Pick your poison, both are good headers! If hatch clearance is an issue, the Bassetts win that battle by about 2". The CMI's are about 1.25" higher than stock 496 risers and the Bassetts are about an inch lower.

Ray @ Raylar

Re: Raylar Results
 

The BCK 103 Kit will add 150 HP to a Volvo 8,1 GS 375 HP or a 375 HP Merc 496 Magnum
You have to change or reprogramm the MEFI or PCM (Merc) to a 420(425) HP version
The BCK 103 kit will add at least 100 HP to a 420 HP Volvo or 425 HP Merc
We dynowed a Merc 496 HO with 542 HP @ 4800 RPM

Re: Raylar Results
 

Your units of measure for HP and TQ is different (N-M) and the curves will not cross at 5250 as we are used to seeing. Any conversion to lb-ft for TQ.

Re: Raylar Results
 

100 NM = 73.7561 lb-ft for TQ

806 NM = 594,5 lb-ft for TQ

the rev limiter is at 5150 - so 5250 is not possible