Hi all
I have found a pair of single lobe camshafts in one of my box of bits, Am I wrong or were single lobed cams only used in the 105 cloverleaf engine? I think I read this somewhere, and googling hasn't produced any results? If so would they only work with mechanical tappets?
All the best
Jon
Camshafts
Re: Camshafts
I've never seen a hydraulic camshaft, but was told it had a slightly different profile to a single lobe 105 cam. This single lobe was just in sud 105 gc's.
You can use the 105 gc's cam on a 1700 engine with mechanical tap pets, I think in the above the 105 was a slightly higher lift.
Someone else will have to clarify for sure.
If you are building a 1700 8v I'd go mechanical with those cams, unless you want some performance ones.
You can use the 105 gc's cam on a 1700 engine with mechanical tap pets, I think in the above the 105 was a slightly higher lift.
Someone else will have to clarify for sure.
If you are building a 1700 8v I'd go mechanical with those cams, unless you want some performance ones.
Re: Camshafts
Thanks veesix, this is food for thought, glad they are identified as 105s
Re: Camshafts
Howdy,
are there not 3 types of head? Mechanical with hex head adjusters, mechanical with shims, and hydraulic? I was under the impression they were all distinct from each other.
I ask because i'm currently playing with some chambered heads from a 33 1.5 Ti (105HP, single lobe, shims), and a 1700 block - to make a high compression 1.7. Was hoping to fit a Gleich manifold that i picked up, but found that it did not line up with the inlet on these heads. However, when i had a good look at some non-chambered heads from a 1.5 sud (95 HP, twin lobe, shims), the manifold lines up perfectly.
So i'm wondering on which heads are the inlets the same? I know that Hydrauluic heads require a longer cam belt, but not sure where things differ? I guess i'm asking a similar question to jon, as in is it possible to mix heads with cams fom other motors? would you need to transplant the whole cambox?
are there not 3 types of head? Mechanical with hex head adjusters, mechanical with shims, and hydraulic? I was under the impression they were all distinct from each other.
I ask because i'm currently playing with some chambered heads from a 33 1.5 Ti (105HP, single lobe, shims), and a 1700 block - to make a high compression 1.7. Was hoping to fit a Gleich manifold that i picked up, but found that it did not line up with the inlet on these heads. However, when i had a good look at some non-chambered heads from a 1.5 sud (95 HP, twin lobe, shims), the manifold lines up perfectly.
So i'm wondering on which heads are the inlets the same? I know that Hydrauluic heads require a longer cam belt, but not sure where things differ? I guess i'm asking a similar question to jon, as in is it possible to mix heads with cams fom other motors? would you need to transplant the whole cambox?
Re: Camshafts
I'm trying to remember this so bear with me, but as I remember it on an 8v there are flat heads and chambered heads.
The earlier 1500 was flat heads, the later 1500 chambered heads, 1700 8v chambered heads.
The single lobed 105 bhp 1500 cam can be used on both head types with mechanical tappets - it's the valve length that is different between mechanical and hydraulic etc.
I had a 1500cc flat head engine with mechanical tappets and single lobe 105 cam, when that engine blew up the cams and cam boxes were lifted off and bolted to a 1700 8v engine, chambered heads.
I also have a 1500 engine, chambered heads, with reprofiled single lobe 105 cams, mechanical tappets.
All the above with are twin carb heads - are single carb heads different, are you sure your 95hp heads are 95 bhp twin carb heads ?
The difference between mechanical , hydraulic and hex adjustment is the cam/buckets and valves, not the heads?
The earlier 1500 was flat heads, the later 1500 chambered heads, 1700 8v chambered heads.
The single lobed 105 bhp 1500 cam can be used on both head types with mechanical tappets - it's the valve length that is different between mechanical and hydraulic etc.
I had a 1500cc flat head engine with mechanical tappets and single lobe 105 cam, when that engine blew up the cams and cam boxes were lifted off and bolted to a 1700 8v engine, chambered heads.
I also have a 1500 engine, chambered heads, with reprofiled single lobe 105 cams, mechanical tappets.
All the above with are twin carb heads - are single carb heads different, are you sure your 95hp heads are 95 bhp twin carb heads ?
The difference between mechanical , hydraulic and hex adjustment is the cam/buckets and valves, not the heads?
Re: Camshafts
My 1980 twin-carb Ti engine had a cracked inlet valve when it came off the pallet after 20 years in storage, so the faulty valve was replaced with one from my outgoing 1978 single-carb 1.5 Ti. Both engines had mechanical valve actuation and twin-lobe cams.Veesix75 wrote:All the above with are twin carb heads - are single carb heads different, are you sure your 95hp heads are 95 bhp twin carb heads ?
Lauren
Re: Camshafts
The single carb engines had the inlet ports in a slightly different place to the twin carb heads, so if the port doesn't line up it must be a head from a single carb engine. The 105 bhp engines had flat heads, but with bigger valves than the 95 bhp engines, with single lobe cams instead of the twin lobe cams, and, I think - all 1700 engines had chambered heads, - hope this helps.
John.
John.
Re: Camshafts
Ok, so as long as i transfer the whole cambox, any mechanical cam can go on any non hydraulic head?
I had been led to believe that the only difference between an 85HP 1500 single-carb motor, and a 95HP twin-carb, was the carbs and inlet manifold(s). it would seem the two motors have different heads too - at least as far as the inlet port position is concerned? Do the two motors have different cams, and different valve diameters? Or is the cam the same from 85HP to 95HP, and it's only on the 105HP head that you get the larger valves and hotter cams?
The heads i'm working on were definitely from a late 1500 105HP car, a G reg 33 Ti, single lobe cams and they're chambered. the 'other' heads i've been playing with came from a 1500 twin-carb engine of unknown origin and are flat with twin lobe cams. I assumed these were 95HP.
In both cases, the original twin carb manifold fits, but not very well - part of the work so far was port matching 2 manifolds to the heads. When i offer up the single-carb manifold, or the gleich one, to the 105HP head, the inlet port is simply in the wrong place. However, with the 'other' heads the single carb manifold and the gleich do fit, in a fashion, but would require some work to match them up.
Is the difference in the inlet port position most pronounced between chambered and flat heads maybe, with some variation in between?
I had been led to believe that the only difference between an 85HP 1500 single-carb motor, and a 95HP twin-carb, was the carbs and inlet manifold(s). it would seem the two motors have different heads too - at least as far as the inlet port position is concerned? Do the two motors have different cams, and different valve diameters? Or is the cam the same from 85HP to 95HP, and it's only on the 105HP head that you get the larger valves and hotter cams?
The heads i'm working on were definitely from a late 1500 105HP car, a G reg 33 Ti, single lobe cams and they're chambered. the 'other' heads i've been playing with came from a 1500 twin-carb engine of unknown origin and are flat with twin lobe cams. I assumed these were 95HP.
In both cases, the original twin carb manifold fits, but not very well - part of the work so far was port matching 2 manifolds to the heads. When i offer up the single-carb manifold, or the gleich one, to the 105HP head, the inlet port is simply in the wrong place. However, with the 'other' heads the single carb manifold and the gleich do fit, in a fashion, but would require some work to match them up.
Is the difference in the inlet port position most pronounced between chambered and flat heads maybe, with some variation in between?