N/A Cams in T5 engine

[FLXC90]

shaker_chi wrote: ↑
Yesterday, 13:07
Since the GLT uses a 2.4 liter motor, isn't it just the normal n/a motor with a low pressure turbo? I would assume it may already have the n/a cams. Not 100% on this though.
No, the GLT engine is the same as the T5 minus the pistons, which makes it a 2.4 and raises the compression ratio from 8:1 to 9:1. Although I'm not 100% sure the difference between the turbo and the N/A blocks, or the difference between the heads and cams on the GLT vs. T5. I really wish we had all this information easily available in one place...

Actually, the LPT engine is 2.4 with pistons different by compression ratio from N/A, The T5 has thicker cylinder sleeves, reducing bore size, that's why it is a 2.3. Also the T5 pistons are even lower compression than N/A or LPT versions. The head is common in turbo motors, with sodium filled exhaust valves, turbo cams. My chilton's is in the car, but I recall cam specs being in the engine rebuild section.

IIRC the benefit of the N/A cams is spreading the torque band through duration increase of N/A cams, and tailoring the RPM range of the curve by advancing/retarding the cams.

[bmdubya1198]

shaker_chi wrote: ↑
Yesterday, 13:07
Since the GLT uses a 2.4 liter motor, isn't it just the normal n/a motor with a low pressure turbo? I would assume it may already have the n/a cams. Not 100% on this though.
No, the GLT engine is the same as the T5 minus the pistons, which makes it a 2.4 and raises the compression ratio from 8:1 to 9:1. Although I'm not 100% sure the difference between the turbo and the N/A blocks, or the difference between the heads and cams on the GLT vs. T5. I really wish we had all this information easily available in one place...

Actually, the LPT engine is 2.4 with pistons different by compression ratio from N/A, The T5 has thicker cylinder sleeves, reducing bore size, that's why it is a 2.3. Also the T5 pistons are even lower compression than N/A or LPT versions. The head is common in turbo motors, with sodium filled exhaust valves, turbo cams. My chilton's is in the car, but I recall cam specs being in the engine rebuild section.

IIRC the benefit of the N/A cams is spreading the torque band through duration increase of N/A cams, and tailoring the RPM range of the curve by advancing/retarding the cams.

That's right, the block is different. 81mm bore in T5 and 83mm in LPT.

[shaker_chi]

So whats the bore on the n/a engine? What's the compression ratio on the n/a pistons?

[bmdubya1198]

So whats the bore on the n/a engine? What's the compression ratio on the n/a pistons?

83mm bore, 10.5:1 compression.
http://new.volvocars.com/ownersdocs/199 ... .htm#pg133

[shaker_chi]

Thanks!!!!! Good info.

[rspi]

I will ALWAYS toss NA cams in the old 2.3L HPT engines, even if they have no tune. The first car I tossed them in was a car I called Raspberry. It took a full second off of the 0-60 time. Someone posted that it added 11 HP on his dyno. I believe it adds 5% over all mods.

I put them in my Yellow sedan and once the boost starts to kick in, it pulls like a jet, no other mods.

[bmdubya1198]

So does anyone know about N/A cams in LPT motors?

[cleven]

I miss the older simpler days. But my old 95 950 I put N/A cams, n/a intake, white injectors, 19t, jap exhaust manifold, full 3in exhaust and Black tube made for a fun ride

[abscate]

I have my T5 apart at the moment so I can make measurements on my cams if that helps anyone.

[bmdubya1198]

So does anyone know about N/A cams in LPT motors?

This is an old post... but I will update this to say that I eventually did install NA cams in my old '98 LPT. The tune was never quite right, so I couldn't say just how much they did, but paired with the NA intake manifold, TB, 19t, and greens, it pulled hard in the higher revs.