Boss 260 V Boss 290

[macka'sxr6t]

  DBOSS said:

  macka said:

  -carty said:

http://www.herrodmotorsport.com.au/index.asp?id=180

some cams information...

might help ya out

<{POST_SNAPBACK}>

Interesting reading, other than some different internals eg (rods & pistons, valves) I still see no reason why you could'nt run the boss 290 camshafts in the 260. Physically they are the same billets with different grinds. No different to the old days of the 302 & 351 clevlands etc

macka

<{POST_SNAPBACK}>

There's quite of difference in the two boss motors and the 290 also runs a higher comp

CYA JEFF

<{POST_SNAPBACK}>

They are from the same castings, are they not 5.4 lt. Internals might be different. Unless there is a physical obstruction from casting differences I bet the camshafts and block moulding, would be interchangable to reduce production costs. Just small changes like valve dia, deck hieght or piston crown.

The 30 kw most likely comes from better engine balancing, valves and intake breathing and different pcm tuning parameters.

Feel free to correct me with blue print specs if anyone has them.

macka

[Guest]

  macka said:

  DBOSS said:

  macka said:

  -carty said:

http://www.herrodmotorsport.com.au/index.asp?id=180

some cams information...

might help ya out

<{POST_SNAPBACK}>

Interesting reading, other than some different internals eg (rods & pistons, valves) I still see no reason why you could'nt run the boss 290 camshafts in the 260. Physically they are the same billets with different grinds. No different to the old days of the 302 & 351 clevlands etc

macka

<{POST_SNAPBACK}>

There's quite of difference in the two boss motors and the 290 also runs a higher comp

CYA JEFF

<{POST_SNAPBACK}>

They are from the same castings, are they not 5.4 lt. Internals might be different. Unless there is a physical obstruction from casting differences I bet the camshafts and block moulding, would be interchangable to reduce production costs. Just small changes like valve dia, deck hieght or piston crown.

The 30 kw most likely comes from better engine balancing, valves and intake breathing and different pcm tuning parameters.

Feel free to correct me with blue print specs if anyone has them.

macka

<{POST_SNAPBACK}>

I thought the fact that the 290 has special bits from the states and is hand assembled with these bits at fpv such as heads cams pistons and etc would mean some thing but I would also say macka is correct in that with a rebuild the 290 bits or better can most definaly be fitted!!!

[xa-coupe]

the 290 has higher comp, different cams and valves and obviously different PCM values. There is no reason you couldn't put the 290 heads on a 260 but it would probably need an edit to get the best out of it. I don't know if the lower compression woudl have any real world benefit but I suspect that FPV / Ford didn't give the 290 higher comp just for the exercise.

They are both assembled at the FPV .. probably by the same people.

Edited 08/08/05 05:42 AM by xa-coupe

[mbjunior99]

Thanks for all the reply's. Very much appreciated

[Venom XR6]

Compression ratio is 10.5 Vs 9.5 in the XR8 due to different pistons.

Camshafts are high lift with different valve springs and shorter valves to suit the higher lift, apart from that the heads are the same.

Crank is balanced more thouroughly.

PULP is required and ECU tune is different.

that's it.

[fordboy1981]

  Venom XR6 said:

Compression ratio is 10.5 Vs 9.5 in the XR8 due to different pistons.

Camshafts are high lift with different valve springs and shorter valves to suit the higher lift, apart from that the heads are the same.

Crank is balanced more thouroughly.

PULP is required and ECU tune is different.

that's it.

that's exactly right...

Dave.

[Lawsy]

Not to mention that higher comp makes the 290 sound better.....

[macka'sxr6t]

  Venom XR6 said:

Compression ratio is 10.5 Vs 9.5 in the XR8 due to different pistons.

Camshafts are high lift with different valve springs and shorter valves to suit the higher lift, apart from that the heads are the same.

Crank is balanced more thouroughly.

PULP is required and ECU tune is different.

that's it.

<{POST_SNAPBACK}>

Thanks Venom

That's what I thought. all the parts would be interchangable although most likely a costly exercise. If I was going to go to all that trouble I'd probably get the heads high flowed and a bit shaved of them to raise the compression a little bit while I was at it. Still would'nt ba as quick as the T but you cannot beat the sound of a lumpy V8 idling.

Look forward to someone really hotting one of these babies up now that we have a tuning tool for them.

macka