Greetings fellas from France.

Please pardon my ignorance with this question.

I usually block the boost port on some of my engines , TT36 , ST G34 , Magnum 36 , MDS 38  etc.

Took my Tower 40 apart to find it has more than one 'boost' port  ?

Which one is the correct one to block please ?

Thanks for any contriburions ,

Robin.

Jim ,

May I ask what was your set-up on your Tower 40 ?

Much obliged ,

Robin.

If you use JB Weld, a heat gun will remove it in a chunk. Don't be too fastidious about cleaning the case before you apply the JB Weld. If you wish, you can carve & sand a soft balsa plug to shape and let it swell up to fit.

Most modern engines have two bypasses and one boost port, which is between the two bypasses. It's diagonally across from the exhaust on the Tower .40,  FP's and LA's. You can see the timing difference when you remove the cylinder head.  The odd one is the boost port.  Steve

Robin, to answer your initial question, the Tower 40 cylinder has four ports but only one is the boost port. The boost port is the almost square one which opens lowest down the stroke. The two smaller rectangular ports each side of the boost port are the Schneurle transfer ports and the rectangular port opposite the boost port is the exhaust.

Whether you block the boost port or not is for you to decide. As has been shown here already, opinions vary as to whether it achieves anything.

http://www.supercoolprops.com/price_list2.php

Here is a link to supercool props price list  All the stunt props are listed at $30 Australian.  Read down at the bottom about conditions.

Thanks, Jim!
Bill