V4 cutaway engine - ApriliaForum sponsored by AF1 Racing, inc.

styx · 06-02-2009, 11:27 AM

Click on the first picture, when the second picture has loaded click again for super close up.

http://www.superbike.co.uk/news/Apri...ws_283636.html

TRexRacing · 06-02-2009, 12:25 PM

Hmmmmmm...............progressive intake valve springs.

azboy · 06-02-2009, 12:44 PM

Quote:

Originally Posted by TRexRacing

Hmmmmmm...............progressive intake valve springs.

They look very similar to the outer VTEC intake and exhaust springs from the Honda V4 VTEC engine. Very similar progressive winding. But I'm sure that is the only similarity between the two....

amauri · 06-02-2009, 12:51 PM

Quote:

Originally Posted by TRexRacing

Hmmmmmm...............progressive intake valve springs.

Very common actually, the V990 has had them since 1998.

Tifa · 06-02-2009, 03:44 PM

they'll never get that motor to run smoothly....there'll be no compression with all that missing metal....

Silver-Bolt · 06-02-2009, 07:16 PM

Kind of interesting that the outer case (brown) cover is structural. Must be bearings to support the starter gears? Not much room between the air box lid and the stacks.

LUCKY DAVE · 06-02-2009, 08:50 PM

Just how much cam timing adjustability do you need? With that much, you could probably make it run backwards!

amauri · 06-03-2009, 01:48 PM

Quote:

Originally Posted by LUCKY DAVE

Just how much cam timing adjustability do you need? With that much, you could probably make it run backwards!

The two intake cams are connected to the crank via chain/sprockets.
The exhaust cams are driven from the intake cams via gears on the opposite end.

The slots you are referring to are for alignment but not for degreeing in the usual way, because it would not allow adjustment of IN/EX independently.

duganc · 06-03-2009, 09:28 PM

The cutaway shows some opportunity for cleaning up the cast head ports.

06-02-2009, 11:27 AM	#1
styx apriliaforum expert Join Date: Sep 2004 Location: Bedale, North Yorkshire / Riyadh, Saudi Arabia Posts: 1,580	V4 cutaway engine Click on the first picture, when the second picture has loaded click again for super close up. http://www.superbike.co.uk/news/Apri...ws_283636.html __________________ Steve When the eagles are silent, the parrots begin to jabber. Winston Churchill.

06-02-2009, 12:25 PM	#2
TRexRacing apriliaforum expert Join Date: Jul 2004 Location: Over the hills and far away Posts: 4,523	Hmmmmmm...............progressive intake valve springs. __________________ It's only a small world if you don't have to walk home.

06-02-2009, 08:50 PM	#7
LUCKY DAVE apriliaforum expert Join Date: Sep 2005 Location: Encinitas, ca Posts: 4,158	Just how much cam timing adjustability do you need? With that much, you could probably make it run backwards! __________________ A finish is a win! Moderation is the key! More wine! And never lend a faggot your hat That's 1000 horses per side with blowers AND turbos, Marc....... '04 Tuono 7 other bikes

06-03-2009, 09:28 PM	#9
duganc apriliaforum expert Join Date: Oct 2003 Location: Chester NJ Posts: 1,861	The cutaway shows some opportunity for cleaning up the cast head ports. __________________ "I feel strongly both ways." '01 Mille Blue (one of 27) chassis #117 - Mods (let's just say a bunch) Former rides: '92 VFR750F '89 NT650 Hawk '63 CB77 Super Hawk

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06-02-2009, 03:44 PM	#5
Tifa apriliaforum expert Join Date: Feb 2009 Location: On the Englandshire side of the Welsh Border Posts: 1,758	they'll never get that motor to run smoothly....there'll be no compression with all that missing metal....

06-02-2009, 07:16 PM	#6
Silver-Bolt apriliaforum expert Join Date: Jun 2005 Location: Seattle, WA Posts: 1,885	Kind of interesting that the outer case (brown) cover is structural. Must be bearings to support the starter gears? Not much room between the air box lid and the stacks.