Sidedraught manifold??

[Ben Wight]

I need to know, does anybody know of or have seen a gemini that is using a twin sidedraught manifold that is not a Lynx 'S' bend type????

I am curious as to how they have achieved this, as every gemini I know of (shitbox FWD's excepted) have a brake booster that restricts the use of a manifold with straight inlet runners.

Do these people discard their brake booster? I just can see how a carby can physically fit as the booster is completely in the way. Even if the manifold angled upwardly, it would still hit. The Lynx manifolds move the surface for mounting of the carbs about 3-4 inches above the inlet ports for brake booster clearance.

Anybody have any leads?

Ben Wight

[Tooleeda]

I know the fluid reservoirs restrict the use of some twin carbs but not the actual booster. The only solution is to move the reservoirs slightly. I recall seeing some done using early model reservoirs, the drawback being slighly less brake boost (which in my opinion is not a bad thing).
By an S-bend in the manifold, do you mean like a 'step' to go above the reservoir? yuk!

[Woz]

someone on here said to make more clearance just make a piggyback engine mount for the drivers side engine mount, that makes more room between the engine & brake setup... dont like the idea of having my engine on an angle all the time (like the valiant .

if your a bit of an engineer, why dont you try to make another type of inlet manifold???

[Ben Wight]

There are two styles of manifolds, one is a Lynx that has a relatively tight radiused bend shaped in an 'S' so as the carbs mount around 100mm or so above the inlet ports, so as to clear the brake booster. With this manifold, a TX brake system must be used, as they have a remote fluid resovoir. The manifold step up is enough to clear the booster, but not enought to clear a TC or later master cylinder and resovoir.

There is another type of manifold, I dont know what brand, that has inlet runners that are straight, and horizontal to the inlet ports, so that the carbs have to sit right where the top half of the brake booster is. If you go out and look at any gemini, follow the line of the inlet port on number 4 cylinder and you will hit the brake booster, this is what I am talking about.

[Ben Wight]

I know someone who has a straight runner manifold pretty cheap, and was wondering how people fit them. It would not be posible to lift the engine up enough by the dirvers side mount, you need nearly 100mm of clearance, and the angle would put the carbs into about a 30 degrees slope, which aparantly sidedraughts dont like.

Ben Wight

[GasGem]

Yes, I have also seen one of these manifolds fitted but the owner used a imported early TX which did not have boosted brakes, and the master cylinder was mounted to the firewall ( Factory), but there was not much room, if you want the boosted you could go for a remote booster like often fitted to the HR holdens,

on my TG (twin webers lynx manifold) I used the TG master cylinder but taped threads inside where the fluid container when, then fitted hoses to a TX fluid reso, without having to change master cylinder,


cheers
Eggy

[Ben Wight]

Thats a good idea, never thought of tapping the standard master cylinder to fit a TX resovoir.

I have also looked into remote boosters, definitely not worth the hassle at all.

I wonder who originally made these straight runner manfolds and what cars they thought they could install them into?

[GasGem]

Maybe they were used in enro Cars RHD, or the Jackaroo 4WD where the brakes & steering would allow more room,
There was a company that sold the Reomote booster as a Kit with length's of flex brake hose,

Also my mate has an Escort race car (Ford Shitter & slower than the Gem,) but it has an aftermarket brake peddal setup all fits under the dash usuing the standard peddal box, and that clears the escort engine bay up for big extractors, it also has 4w disks, hyd hand brake and no booster but it stops dam well,

cheers,