It was the kind of loud that one's wife would hate, but your girlfriend would love.



ok, so I tricked you. It's a 70 that I cloned to be a '66 TT, because I always wanted one but couldn't find or afford a rare real one.



Also restored a 69 BSA Victor 441 and sold it at Las Vegas Auction to a Museum collection. very slow-but would go straight up the side of your house. he, he.

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK    

Alan, shame on you, straight pipes! From the front brake that would be a 66 or 67. My Triumph is a 2003, 3 cyl, water cooled. six speed, ThunderBird Sport. Don't have photos, I also have a '68 BSA Firebird, with mufflers!. They don't work much, but they're on it. 

Frank/Rebop

Bristol, In ( by Elkhart) 

Frank, here's my old Triumph. Don't have it anymore though-been gone several years now.

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK    

Charlie,

          I'm guessing, but I'd want to be down around a true 9:1 with a blower.

 Many of the modern engines run 9 or 10 to one with 87 or 89 octane, chamber design has improved a bunch since the early 50's. My 11 to one Triumph MC runs fine on 89 octane, and it's carbureted, no computer.

Frank/Rebop

Bristol, In ( by Elkhart) 

That will be sweet. Then will they be suitable for boosted applications? I'm thinking the compression will still be too high. I'll be at about 10.5:1 if I swap a set on.


Lawrenceville, GA

Paul,

       Not so, the heads will have a TON of deck material, you'll be able to mill them quite extensively. They are already going to be delivered with a smaller than G head combustion chamber, which will raise the static CR over any iron head. Also, as Charlie mentioned, Aluminum heads can be a half point higher at least and have the same octane requirement as iron. John has revised the chamber and relocated the plug, both of which are designed to lower the octane requirement over the iron version. I'll bet these heads will run 9 or 9 1/2 to one on 87 octane. Hows that? 

Frank/Rebop

Bristol, In ( by Elkhart) 

An increase in compression with aluminum heads does not necessarily mean you will have to use a higher grade fuel.  For the same reason that aluminum pulls heat out of the cylinder more efficiently than steel, an aluminum headed engine also more readily resists detonation.  So higher compression can be run without the need for higher octane, but only to a point.  Changing from iron heads to aluminum heads and increasing compression by a point or so should not require higher grade fuel.  Looking at the flow numbers of the heads, I think they are geared a liittle more to the performance side but we'll have to wait for dyno results to really see what they do.


Lawrenceville, GA

I can't put words in Mummert's mouth obviously, but I suspect in order to make the heads accessible to a wide cross section of customers, (and financially feasible) he has to keep the compression down somewhat. Not everyone is involved in racing or wanting to pay for premium gas everyday. For those seriously into competition, domed pistons may be necessary in some cases.

Paul

Doing the math, it looks like it will raise the compression of a given engine by at least 1 point when compared to G heads.  It will be a larger increase on larger engines.  And potentially larger depending on the heads currently installed on that engine.  The increase is necessary to make up for the heat lost due to aluminum's ability to dissipate heat more effectively than iron; heat lost is lost power, increasing compression gets it back.


Lawrenceville, GA

I talked to John yesterday, the set of heads that are pictured is the only set todate.  He plans to cast two more sets next week and he is still shooting for early spring for release to the public. I suspect that it will require placing an order and then waiting for him to cast and machine a set due to the investment. I called him in Aug to buy one of the new intakes, he said they should be ready in Oct, but as of yesterday he did not have them ready. I think he has been spending all his time working on the heads. He said that he would try to have the intakes done in 3 to 4 weeks.

Glen Henderson



Freedom is not Free

Letohatchee, AL