iv got the hyper 7 tq sport with a 4 port engine. would i be able to put the 8 port straight in or will i need to upgrade some of the gears as well?

Hi should be fine to just put the engine straight in, changing the gears clutch bell(pinion) gear or diff gear should only change the gear ratio eg. acceleration/top end speed...the pro has the same grade metal as the standard and other version apart from the diffs of coarse they have different diffs from the standard ones not sure which diffs come with the tq but i presume it's the same as the standard hyper 7...just make sure you have the mesh correctly adjusted to suite.

man you wanna sell that 4 port ? they are the best hyper engine ever !!

The Pro runs the SAME diffs as the TQ, UNLESS you use the optional Torsen, the PRO UK runs Spiders for all 3 a standard. The 4 port is the better engine for longevity but the 8 port is a little faster with the same gearing. But it IS a straight swap. The only difference is the liner.

so would i be able to just take the 4 port out and put the 8 port in its place? all the stuff you mentioned just confuses me. and i probably wont sell the 4 port, best to have a spare. this is just an idea at the moment. i dont even have the hyper 7 yet

****Yes it will fit straight in you have to change nothing**** most .21 engines will fit the hyper range, i have since owning my hyper 7 changed the standard 4 port for a rossi .21 circuit then to a pro uk boost...no difference with the engine mounts only the rossi has a shollower crank case so it was eating starter wheels but no strengthening to the clutch or spur gear is required...i hope this answers your qeustion,

as for others i am quite familiar with all versions in the hyper range i was simply trying not to go into too much detail as described later in the post...

...and i was actually talking about the grade of material that the clutch bell gear(pinion) and the spur which is attatched to the diff housing and explainig that the gear need not be strengthened, as the original qeastion was aimed at and anyway the pro r comes with centre torsen diff as standard

and the piston..

LOL yeah, have you tried to buy a liner on it's own. If it's Brand new though you could just swap the liner as they aren't matched that well, well not as well as Piccos are.