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-   -   Carb to EFI (https://www.offshoreonly.com/forums/general-q/380214-carb-efi.html)

techman 08-17-2023 08:37 AM


Someone knows the size of these TB merc 565 is using ?
Not sure of the size, but it is the same part # used on all the QC motors and some OB's.

Nosfool 08-17-2023 09:12 AM

From what I have read I believe they are 80mm throttle bodies.

Bulitz 08-17-2023 09:51 AM

It’s written made in Germany probably bosch .

Nosfool 08-21-2023 04:43 PM


Originally Posted by articfriends (Post 4876846)
yes, it will take work to get the volute to fit over it, I cut one down w die grinder to get it to fit, the most recent one rookie posted pics of we used mill and rotary table to cut lip down and bored the volute

https://cimg7.ibsrv.net/gimg/www.off...0794de0e1.jpeg
https://cimg0.ibsrv.net/gimg/www.off...00668def1.jpeg
This is the setup that I am running with Holley hp efi and dual sync distributor and smart coils like the 700sci use.
https://cimg2.ibsrv.net/gimg/www.off...cb5fee884.jpeg

Rookie 08-21-2023 07:59 PM

What thermostat housing are you using?

articfriends 08-22-2023 05:22 AM


Originally Posted by Rookie (Post 4877330)
What thermostat housing are you using?

I was wondering that myself, looks like one for a jet boat

Nosfool 08-22-2023 06:27 AM


Originally Posted by Rookie (Post 4877330)
What thermostat housing are you using?

https://cimg8.ibsrv.net/gimg/www.off...a5877680b3.png
Just divided water outlet from Hardin

Bulitz1 08-22-2023 07:09 AM

https://www.enginelabs.com/news/test...s-on-the-dyno/


I think TB on the surface of plenum is better . Saw this article this morning

articfriends 09-01-2023 05:27 PM

1 Attachment(s)

Originally Posted by Nosfool (Post 4877299)
https://cimg7.ibsrv.net/gimg/www.off...0794de0e1.jpeg
https://cimg0.ibsrv.net/gimg/www.off...00668def1.jpeg
This is the setup that I am running with Holley hp efi and dual sync distributor and smart coils like the 700sci use.
https://cimg2.ibsrv.net/gimg/www.off...cb5fee884.jpeg

I have the customers 548 on the dyno, ordered this to try to gain tstat hsg clearance , the air horns already hitting the only dyno tstat housing I could get to fit at all. Gonna run it with it and without it of course and see what it does to the hp. Attachment 577752

Nosfool 09-01-2023 06:17 PM

That may be the ticket there to get the clearance for the volute


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