I have an option to buy cams from an Omex Duratec 200bhp spec engine but cannot find the lift and duration specifications, does anyone know what they are?
i believe they are A custom grind by Kent cams but can’t find any info
I have an option to buy cams from an Omex Duratec 200bhp spec engine but cannot find the lift and duration specifications, does anyone know what they are?
i believe they are A custom grind by Kent cams but can’t find any info
The standard Ford cams will make 198 at 7500rpm, you just need uprated valve springs and ARP flywheel bolts to support the higher rpm
These will make 210bhp
Omex got back to me and said they are ground to use the timing bar for setup also come with verniers so I’m buying them
sounds like an expensive 12 bhp
The 210 spec cams do make a nice engine, if you stick to the 7500rpm limit the standard pistons and rods will last forever with regular oil changes
There is now some doubt about the cams, Omex day the numbers are not ones they use, the person I bought them from says they came from an Omex built engine.
Does anyone know what cam producer these numbers stamped in the end of the cams Relate to?
1004 IN 304
1004 EX 304
The lobe profile is another possible issue as base circle minus lobe heigh points to no extra lift but the lobe nose is much wider than other Duratec cam profiles I have seen
I would hazard a guess at 10.04 mm lift, 304 duration
Might be worth asking Newman cams as their cams are usually marked lift then duration, but these appear to be a custom grind.
What are the uprated springs that are being used to get the 198 hp at 7500
This is interesting as i have a st 150 duratec ready to go in my car at some point. I assume the springs and flywheel bolts allow the engine to rev higher. What would a standard engine rev to without them and what would you expect in power. I ask as i have just bolted my head down etc and don't fancy having to remove again.
Thanks
Hi wildo,
These numbers are all engine and spec dependant (inlet/exhaust), oil pressure also has a big part to play but this gives you a rough idea.
Std pistons, rods, cylinder head ports, ford cams & ford valve springs - 180ish @ 7000
Std pistons, rods, cylinder head ports, ford cams but Cosworth valve springs - 198ish @ 7400
Std pistons, rods, cylinder head ports but 210 spec cams and Cosworth valve springs - 210-220ish @ 7800
I probably should add, all these engines have ARP flywheel bolts and fixed chain tensioners
Great info, I didn’t realise valve springs could make that amount of difference
Higher rpm is an easy way to gain power, you could take the standard cams to 7800 but there isn't much point because the power drops right off
Further research found that cam was a special grind from Piper Cams and had the same lift as standard inlet for both cams, the large duration was an issue and I wasn’t comfortable with that aspect.
I got my money back and will look at Cosworth springs. Initial research shows that there are several Cosworth springs rates available so which ones am I looking for?
The 11.5mm valve spring set support upto the D-TEC35 cams from Kent
Last edited by SimonD; 07-07-2020 at 14:02.
I have a set of Cosworth springs available that are rated at 62Lbs 38.mm seat and 180Lbs at 27.5mm good for 10.5 lift, if these will do then I’m good to go.
Puma speed are showing what they say is are Cosworth spec cams 255 duration 9.5 lift at 114 deg inlet and 113 ex
Jamsport are saying 275 and 9.5 so I suspect they are showing duration at seat timing not 0.050”
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