My 340 Rebuild!

Trigger_Andy · Post by **Trigger_Andy** » Fri May 22, 09 9:28 am

I'm sure some of you know that Bacca is rebuilding my 340 for me. Well it was in a right sorry state when he got it, almost to the point of not saving. But we desided to carry on even though it would have been cheaper starting again with a 360!

Well, he has sent me some piccies of the rebuild so far and it looks amazing! He's put some amount of work into this and I'm really looking forward to it being finnished.

Trigger_Andy · Post by **Trigger_Andy** » Fri May 22, 09 9:36 am

I cant remember everything bacca has had to do to the Engine but I know the Crank needed a re-grind. Its had or is gonna get a new Oil Pump and Drive Shaft, I think a Standard 340 Cam and Lifters, Drive chain and Gasket set.

Pete · Post by **Pete** » Fri May 22, 09 9:37 am

Sweet, I like 340's.
What is it going in?

Trigger_Andy · Post by **Trigger_Andy** » Fri May 22, 09 9:39 am

I dont have a car to go with this nice shinny new Moter but I'm always on the look out for something cheap and cheerfull!

Next to go on is the Eddie Heads and Roller rockers!

Ivor · Post by **Ivor** » Fri May 22, 09 9:55 am

Blimey Trig, a Mopar related post! Are you alright?

That's coming along nicely, why the standard 3450 cam with the Eddy heads? That's going to breath better than a standard iron headed motor, shame not to benefit from that, I would have thought?

Post by **TyreFryer** » Fri May 22, 09 10:06 am

I'm doing the same as that with my 340 at the moment Andy.

Check out these for cams: http://www.compperformancegroupstores.c ... =LACAMHFHE

Trigger_Andy · Post by **Trigger_Andy** » Fri May 22, 09 10:42 am

Ivor wrote:Blimey Trig, a Mopar related post! Are you alright?

Sorry, i'll no make a habit of it!

Ivor wrote:That's coming along nicely, why the standard 3450 cam with the Eddy heads? That's going to breath better than a standard iron headed motor, shame not to benefit from that, I would have thought?

Cheers, I'm not sure why he chose that Cam but I think it was so it would be drivable on the Street? I could ofcourse be wrong about the Cam though. I'm Sure Bacca will confirm at some point.

Thanks for the Cam link Martin, I'll have a look-see!

Kev · Post by **Kev** » Fri May 22, 09 10:52 am

Blimey! There's some compression going on in there judging by the #8 slug!!!

Dave999 · Post by **Dave999** » Fri May 22, 09 11:02 am

naa its just waiting to be whacked with a mallet while a screw driver prizes that ring inwards

dave

Ivor · Post by **Ivor** » Fri May 22, 09 11:15 am

Wot,no big jubilee clip?

Trigger_Andy · Post by **Trigger_Andy** » Fri May 22, 09 11:53 am

Yip the 8th and last piston heading home. They are 10.5-1 Forged pistons 30th over, but have been skimmed to work with the Eddie Heads. The Block has also been Decked. One side was 26th out over the other!

Am I right in thinking that the Ally Heads drop the Comp ration down by a point? I'll have to ask Bacca what he believes the new Comp will be with all the work done and what BHp and Torque he expects it to make.

Dave-R · Post by **Dave-R** » Fri May 22, 09 12:55 pm

Trigger_Andy wrote:Am I right in thinking that the Ally Heads drop the Comp ration down by a point?

You are confusing compression ratio with cylinder pressure.

Anonymous · Post by **Anonymous** » Sat May 23, 09 1:14 am

Dave wrote:
Trigger_Andy wrote:Am I right in thinking that the Ally Heads drop the Comp ration down by a point?
You are confusing compression ratio with cylinder pressure.

Trigger_Andy · Post by **Trigger_Andy** » Sat May 23, 09 8:28 am

Dave wrote:
Trigger_Andy wrote:Am I right in thinking that the Ally Heads drop the Comp ration down by a point?
You are confusing compression ratio with cylinder pressure.

Oh, ok. And does C.P have any relationship with C.R. What advantages or disadvantages does the Ally heads make when they drop the C.P down a point?

mopar_mark · Post by **mopar_mark** » Sat May 23, 09 12:14 pm

Compression ratio simplified - Is a ratio of the volume of the cylinder bore. The amount of volume in the bore when the piston is at the Bottom of its stroke v the amount of volume in the bore when the piston is at the Top of its stroke
Imagine the volume was 800cc a@ BDC & 80cc @ TDC = 8:1

Cylinder pressure is what the engine actually sees, pressure is affected by numerous factors - Cylinder Heads, Cam, Carb, fuel, etc including comp ratio, all of these all combined determine comp pressure.