tr3gt Posted October 10, 2014 Report Share Posted October 10, 2014 Hi, In my search for the right intake manifold for my low port head 302114 I found this one. It is made from steel and welded professionally. The carburetor side measures 1.75 inch and the other side 42.5mm. Who can tell me the difference between intake manifold 302006 and 302118. I understand that both fits the low port head but which is the right one for my head? The ports from my head are 38mm. Thanks for any help. Frans Quote Link to post Share on other sites
Don Elliott Posted October 10, 2014 Report Share Posted October 10, 2014 Alec - Regarding your mention above about efficiency and price of the various manifolds, I checked my Catalogue of Master Parts List and Prices published by S-T in New York for "Triumph Models USA - 1958. Listed are the parts below. 302006 - Inlet Manifold - TR2-3 - selling price in 1958 US$14.40 302118 - Inlet Manifold - TR2-3 - selling price in 1958 US$20.00 302119 - Inlet Manifold - TR2-3 - selling price in 1958 US$14.50 Cheers Don Elliott Quote Link to post Share on other sites
Lebro Posted October 10, 2014 Report Share Posted October 10, 2014 Frans. The manifold in your photo looks identical to the one formally on my high port TR3 when I bought it in 1971. Following last years rebuild I took the opertunity to swap it for a standard high port inlet manifold. The steel one ended up on another engine which the TR shop purchased from me. In hind sight the steel one was probably better for performance as the flow of gasses is much more direct. Bob. Quote Link to post Share on other sites
tr3gt Posted October 12, 2014 Report Share Posted October 12, 2014 Frans. The manifold in your photo looks identical to the one formally on my high port TR3 when I bought it in 1971. Following last years rebuild I took the opertunity to swap it for a standard high port inlet manifold. The steel one ended up on another engine which the TR shop purchased from me. In hind sight the steel one was probably better for performance as the flow of gasses is much more direct. Bob. Bob, thank you for your answer. I found another thread about low port inlet manifolds and I understand 302006 and 302118 have only minor differences and I can use both. Is there anyone who has one for sale for me? Thanks, Frans Quote Link to post Share on other sites
stuart Posted October 12, 2014 Report Share Posted October 12, 2014 Bob, thank you for your answer. I found another thread about low port inlet manifolds and I understand 302006 and 302118 have only minor differences and I can use both. Is there anyone who has one for sale for me? Thanks, Frans I have a 302118 if you still require. Stuart. Quote Link to post Share on other sites
JJC Posted October 12, 2014 Report Share Posted October 12, 2014 JJC has a Derrington inlet manifold on his ex- Derrington car. If you are reading this John does it have IT3 on it anywhere? I'll have a look on Tuesday when I'm back from Yorkshire. Can you believe I got a touch of sunburn today! JJC Quote Link to post Share on other sites
JJC Posted October 12, 2014 Report Share Posted October 12, 2014 I Did Derrington ever make an inlet manifold for SUs? The "IT3" stamped manifold is fabricated from steel - it's not an alloy casting. Well made, but it does leave the door open to it being a special. AlanR Yes he did - our TR2 has the Derrington manifold with SUs. It is a casting. I'll post a picture in a few days. JJC Quote Link to post Share on other sites
vivdownunder Posted October 12, 2014 Report Share Posted October 12, 2014 Frans, inlet manifold 302006 was for 1.75" SU carbies on the low port TR3 "Le Mans" head. Manifold 302118 was for 1.75" SUs on the later high port head. This manifold can be used on a low port head, although the peaks that sit above the head will need reshaping for a neat fit. Both manifolds are for 38mm port heads. I don't know who made your fabricated inlet manifold, but I've seen similar manifolds years ago on race cars. Later TR3A heads had a 1/4" deep rebate let into the inlet port entry that measured 1.5/8" or about 42.5mm diameter. This rebate was often reworked into a bell shaped entry to try and speed up gas flow through the port, which could explain why your inlet manifold is 42.5mm. Competition manifolds were sometimes made shorter to allow SU velocity stacks that otherwise would not clear the inner guard. Viv Quote Link to post Share on other sites
JJC Posted October 15, 2014 Report Share Posted October 15, 2014 Hopefully attached should be a photo of the Derrington inlet manifold with SUs on the car. JJC Quote Link to post Share on other sites
stuart Posted October 16, 2014 Report Share Posted October 16, 2014 P1020041(1).JPGHopefully attached should be a photo of the Derrington inlet manifold with SUs on the car. JJC Dont want to worry you but I would redirect your carb float chamber overflows somewhere a bit safer than they are in that picture. Stuart. Quote Link to post Share on other sites
JJC Posted October 16, 2014 Report Share Posted October 16, 2014 Dont want to worry you but I would redirect your carb float chamber overflows somewhere a bit safer than they are in that picture. Stuart. Stuart - I do see what you mean. It isn't the original exhaust manifold because thing of beauty though it is, it developed pinholes. So there's no danger of naked flame from the exhaust. Where does the danger arise, starter? Wandering off a bit, I can't remember for the minute where the equivalent overflow is on the Strombergs on the 4. I was only looking at them yesterday and I can't picture an overflow pipe wandering off into deep safety. Mine don't overflow as yet so I can't say where it would go but I vaguely remember some time ago on my son's GT6 seeing overflow simply coming from the bottom of the float chamber. (We fixed it). JJC Quote Link to post Share on other sites
stuart Posted October 16, 2014 Report Share Posted October 16, 2014 (edited) Danger being hot exhaust .Originally the pipes were directed into the air filters when the black steel mesh ones were fitted. Though a better idea is to extend them down to the chassis level and outwards like the Healeys were. Stuart. Edited October 16, 2014 by stuart Quote Link to post Share on other sites
JJC Posted October 16, 2014 Report Share Posted October 16, 2014 Danger being hot exhaust . Stuart. So what happens with the Strombergs? JJCPS those overflow pipes are as they came with the Derrington fitted carbs Quote Link to post Share on other sites
BrianC Posted October 16, 2014 Report Share Posted October 16, 2014 The overflow pipes in that position would be an MOT failure if spotted. Mine were similar to this although extended beyond the filters and my usual MOT man only picked it up after about 4 MOTs because one of the float chambers was flooding due to a stuck needle valve. Overflow were rapidly extended down to below chassis level in the wheelarch. Makes an awful lot of sense, especially if you have ever had a car on fire! Quote Link to post Share on other sites
JJC Posted October 16, 2014 Report Share Posted October 16, 2014 The overflow pipes in that position would be an MOT failure if spotted. Mine were similar to this although extended beyond the filters and my usual MOT man only picked it up after about 4 MOTs because one of the float chambers was flooding due to a stuck needle valve. Overflow were rapidly extended down to below chassis level in the wheelarch. Makes an awful lot of sense, especially if you have ever had a car on fire! So what do we do with the Strombergs? Quote Link to post Share on other sites
Fireman049 Posted October 16, 2014 Report Share Posted October 16, 2014 Hi Everyone ~ Yes indeed, I've attended more than my fair share of car fires and believe me they were really heart breaking ~ especially the Classic cars!!! My 'E'-type Jaguar has the overflow pipes running down below the chassis ~ and I've copied the idea to my TR3A. "You know it makes sense!" Tom. Quote Link to post Share on other sites
Lebro Posted October 17, 2014 Report Share Posted October 17, 2014 Having got HS6 carbs on my '3 there is not much I can do about the overflow. If the float chambers do overfill, then the excess fuel just seeps out of the top of the chamber, there is no pipe. Bob. Quote Link to post Share on other sites
Ashley James Posted October 17, 2014 Report Share Posted October 17, 2014 Rolls-Royce got that one wrong on the MK VI Bentley, they had the front SU overflow onto the Dynamo brushes and it caused quite a few fires over the years. Quote Link to post Share on other sites
stuart Posted October 17, 2014 Report Share Posted October 17, 2014 So what do we do with the Strombergs? Carry an extinguisher. Stuart. Quote Link to post Share on other sites
Ian Vincent Posted October 17, 2014 Report Share Posted October 17, 2014 Having got HS6 carbs on my '3 there is not much I can do about the overflow. If the float chambers do overfill, then the excess fuel just seeps out of the top of the chamber, there is no pipe. Bob. Bob, You can buy replacement lids for HS6 carbs that do have an overflow pipe from Burlens. They cost about £25 each. Mine already had them when I bought them. Rgds Ian Quote Link to post Share on other sites
Lebro Posted October 17, 2014 Report Share Posted October 17, 2014 Can't see which one I need on their web site, will give them a ring next week. Bob. Quote Link to post Share on other sites
JJC Posted October 18, 2014 Report Share Posted October 18, 2014 Ashley has pointed out the worst thing you can do is to direct an overflow anywhere near a spark. Presumably that's the starter, Dynamo, and distributor. The starter of course is down at chassis level. JJC Quote Link to post Share on other sites
Lebro Posted October 22, 2014 Report Share Posted October 22, 2014 New float chamber lids on order Quote Link to post Share on other sites
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