The V8 Owners Forum -

Visually, it could be a standard camshaft. https://up.picr.de/50568893un.jpg It also has the CWC marking and no stamping on the face. https://up.picr.de/50568895op.jpg You should measure the cam lift. In my opinion, that doesn't match the compression ratio at all. Are those really 28cc cylinder head...

On the back of the camshaft, there's only "CWC" printed on it, nothing else?

Take a picture of the camshaft. Something like this.





Regards,
Frank

Holy cow! I made myself an Excel spreadsheet to calculate compression ratios. A 3.5L engine with 10.5:1 pistons, sheet metal gasket, and 28cc cylinder heads » has a calculated mechanical compression ratio of an unhealthy 12.47:1 !! :shock: I'm afraid I don't know anything about the camshaft. Have yo...

Hello, In my opinion, it's a big mistake to install an Edelbrock/Holley 4-barrel carburetor like that. It might be halfway decent for cars with large engines that are always driven hard. But for everyday driving, there's nothing better than the SU. The engine doesn't look standard. I see tubular exh...

Hello,

unfortunately I don't have any information about the air filter.

The topic of the Boxer 4x SU is super interesting though. I have one installed on my Morgan.





Greeting Frank

It's really annoying that the camshaft specifications aren't standardized. That's also why I went to the trouble of measuring the camshafts. I had also bought some as part of a package with other parts. New camshafts with numbers for which I couldn't find any information anywhere. After measuring th...

Hello, see: https://www.v8tuning.co.uk/viper-hurricane Unfortunately, it's currently out of stock. I could recommend the Piper RP4. It's quite similar to the Hurricane and runs extremely smoothly and cleanly at very low RPMs. https://up.picr.de/50334418fo.jpg It's no longer listed on Piper's website...

Larger intake funnels shift the optimal airflow upwards, thus tending to lead to more power. However! They also worsen cylinder filling at low RPMs, thereby reducing torque. If the smaller funnels are still available, reverting to the smaller ones would improve the engine's versatility. Swapping the...

That's what I would have expected.

Theoretically, a larger valve overlap should only make sense on a turbocharged direct-injection engine. It would improve scavenging without heating the exhaust.

Interesting! I'd never thought about that before (due to my problem).

Cheers

It could just be a tuning issue ? The Rhoads were ticky, but no real annoyance really. As to how much they really changed things, no idea, as don't think I ever ran them against standard type lifters to compare. In principle, Rhoads lifters cut off the lower part of the cam profile. But only at ver...

One other thing I did wonder about is whether there is any lost motion with a hydraulic lifter. I've never had one of these apart but I'm guessing they have some sort of port in them to let oil in which will close off as the lifter rises (similar to a brake/clutch master cylinder) this could result...

A key factor in determining whether a camshaft performs well at low RPMs or whether the engine reacts roughly is the overlap. The lower the point at which the intake and exhaust curves overlap, the smoother the engine will run. As is often the case, more isn't always better. Sacrificing a few horsep...

That's exactly right. A camshaft that makes a 3.5L engine aggressive will, at best, make a 4.6L engine sound sporty. The stock camshafts are already quite tame. Unfortunately, I don't have a curve for the 3.9L. Here are the curves for the 3.5L, the Typhoon, and the Viper Hurricane. https://up.picr.d...

The modification usually involves the height of the valve guides. To allow for the increased lift, the guides need to be shortened at the top. Different valve springs are probably also installed. A camshaft with slightly less lift isn't affected at all. I've had good experiences with the Viper Stump...

Hello,

I'm guessing it's a DW270 Viper Typhoon.





Regards, Frank