Hay all

I will be investing in ralliart cams in the next couple of weeks. I wanted to ask a couple of questions before buying. Ive heard that not all ralliart cams had the same lift. When i find some and buy them how can i know the cams are the proper lift.? Were can i buy the cams from? Are the 380 cams the exact same cam off the ralliarts?

Thanks Kurt

The 380 cams are the same as the Ralliart, the Ralliart are #7 the 380 are #15

in short, if the cams ahve the above numbers you are safe

The Ralliarts did have some cams replaced, rear bank under warranty as people complained that they were noisy, these were replaced with #6 cams, only found this out when I went to purchase some old stock Ralliart cams and found that the rear cams were in fact #6 cams bagged up in Ralliart part number bags

I may have a set of #15 cams later this week available

Yep as Mal has said, just get the 380 "15" cams and all should be good.

HEy Mal, i got a set of cams from wrecker, he rekons they came from 380 but they have #7 on them.....

HEy Mal, i got a set of cams from wrecker, he rekons they came from 380 but they have #7 on them.....

If they have a "7" at the end of the number on the cam then they are ralliart cams

Went into garage had another look, both cams have #7 on em, when i was looking for them i was asking for 380 cams, i guess it is remotely possible guy at the wrecker had a wrecked ralliart & knew that cams are the same. or perhaps some 380 came with #7????

Maybe im looking at the wrong number? Is the number shown on both sides sides of the cam?

Will be either a 7 or a 15 on its own

Each cam will have it stamped at the end oppersite to where the cam gears go and no NO 380's had the #7 cams, they all were #15's either way you have the same profile so does not really matter

hahahahaha thanks Mal, im just an idiot, i was looking at the number which was on the screws at both sides of the cam & it had #7 on both. I found the engraving now, one is random number & then separately it has #15 on it........

does a higher comp ratio by pistons help an engine have a higher maximum power rpm?

does a higher comp ratio by pistons help an engine have a higher maximum power rpm?

Not really.
i.e. 3000GT TT models are 8:1, NA are 10:1. All make peak power at the same RPM. Also has alot to do with the camshaft of choice.

does a higher comp ratio by pistons help an engine have a higher maximum power rpm?

In a NA engine YES BUT just throwing hi comp pistons in by themselves wont give you much of a increase..... You have to do all the supporting work as well.

Look at V8Supercabs they are limited to 10.5:1 compression as well as revlimited to 7500rpm.... this is done to limit outright power (and to also help them last instead of blowing up) that they can make especially now they are running on E85 fuel.

In a NA engine YES BUT just throwing hi comp pistons in by themselves wont give you much of a increase..... You have to do all the supporting work as well.

Look at V8Supercabs they are limited to 10.5:1 compression as well as revlimited to 7500rpm.... this is done to limit outright power (and to also help them last instead of blowing up) that they can make especially now they are running on E85 fuel.

So do u reckon the ralliart magna made its higher rpm power just by its upgraded cams.?

So do u reckon the ralliart magna made its higher rpm power just by its upgraded cams.?

Some of it but not all of it. The slightly higher compression, plus the small amount of head work , plus the ralliart headers and the different ecu tune all combined to give the final outcome.
When i was hanging out with the resident doctor evil in the MMAL engine room many moons ago, he said that the ralliart cams in a otherwise stock sport/vrx added around 5-8kws at the flywheel at best (average was around 5)

As i said, cams alone wont give you the whole box and dice, all the other small things added together along with good cams = a nice outcome. Example is the "Donkey" engine in my magna, its nothing over the top in the way of internal mods its just that what i have done to it has "clicked" and produced a damn fine little engine.

Some of it but not all of it. The slightly higher compression, plus the small amount of head work , plus the ralliart headers and the different ecu tune all combined to give the final outcome.
When i was hanging out with the resident doctor evil in the MMAL engine room many moons ago, he said that the ralliart cams in a otherwise stock sport/vrx added around 5-8kws at the flywheel at best (average was around 5)

As i said, cams alone wont give you the whole box and dice, all the other small things added together along with good cams = a nice outcome. Example is the "Donkey" engine in my magna, its nothing over the top in the way of internal mods its just that what i have done to it has "clicked" and produced a damn fine little engine.

There wasnt head work done to flow was there? I was told just hardened valve springs.

There wasnt head work done to flow was there? I was told just hardened valve springs.

They deshrouded the area around the valves in the combustion chambers. The small amount that was done although minor, did have a effect on the flowing ability of the heads.

There wasnt head work done to flow was there? I was told just hardened valve springs.

Ralliart heads were designed for better flow.