corolla 5k soild vs. hydra/ what induction

[adamke35]

gday gday. ok so here it is. i have a ke35 with a fresh bottom ended 5k. up top ive bought a worked and flowed double valved spring 5khead running approx 150cfm. i need to determine a cam, and in theory need to determine valve springs to suit the cam. i am in the process of checking spring pressure, bind and closing load. but as it stands. DO I???? choose solids or hydraulic lifters.?

Tighe has told me to straight swap my 5k valve train for 4k solids. everything is a straight swap. lifters, rods, cam and rockers. how true is this and is so, what is my benefit?

i am close to purchasing a single 42DCOE weber and am wondering if I'm going to lose power and will it be a worthwhile swap


ideally i am looking for a motor happy to sing to 7 occasional 8thou rpm, lightened flywheel, freeflowing extractors, 2" open exhaust

i just need to decide cam, induction and lifter spec. i will be getting the dizzy recurved to suit the cam.

the head has been skimmed 30thou, and i have no idea of compression ratio until i cc the slugs in the motor.

any help would be fantastic. i can only take so much info from cam grinders/engine rebuilders until i get real corolla driver info

cheers adam

[oldcorollas]

Tighe has told me to straight swap my 5k valve train for 4k solids. everything is a straight swap. lifters, rods, cam and rockers. how true is this and is so, what is my benefit?

well, for a start, they are not on the money
rockers and shaft and towers will swap.
lifters are DIFFERENT diameter between solids and hydro.
as a consequence, pushrods do not swap.
cam shoudl swap, but some engines have different depth plugs at the end of the cam tunnel, so need to check you have clearance.

you can either lock the lifters solid (heavy), or get ones from something else (some holder thing or other can be used apparently)

i am close to purchasing a single 42DCOE weber and am wondering if I'm going to lose power and will it be a worthwhile swap

if you are going sides, then twin will be a whole lot better (more even mixture distribution, rather than the pulsing that will happen), and easier to find manifold for

ideally i am looking for a motor happy to sing to 7 occasional 8thou rpm, lightened flywheel, freeflowing extractors, 2" open exhaust
i just need to decide cam, induction and lifter spec. i will be getting the dizzy recurved to suit the cam.
the head has been skimmed 30thou, and i have no idea of compression ratio until i cc the slugs in the motor.
any help would be fantastic. i can only take so much info from cam grinders/engine rebuilders until i get real corolla driver info
cheers adam

i have a camtech 609, and it probably has the power range you are looking for perhaps... thats a 275/284 solid cam with 435thou lift and abotu 230-235@50thou
you might need to check valve clearance to pistons, to see what lift will be safe, but shouldn't be a big problem, although the 5K chambers are thin compared to 4K.

induction.. why not go EFI? plus a megasquirt, and control fuel and ignition
if you go sidedraught, you will need to choke them down to make it drivable anyway, but EFI = no chokes

[bmak]

The 4k valve train will fit but you will need chev solid lifters or similar as it has larger lifter bores than a 4k.

If only spinning to those sorts of revs i'd be inclined to keep hydraulic.

[NME308]

ideally i am looking for a motor happy to sing to 7 occasional 8thou rpm, lightened flywheel, freeflowing extractors, 2" open exhaust

i just need to decide cam, induction and lifter spec. i will be getting the dizzy recurved to suit the cam.

Decided already if the first sentence above is true - solid it is!

If you give a no nonsense honest set of specifications to a cam grinder they will give you a cam which will perform. Full stop.

A cam grinder will know BS from the first sniff i.e. tell them you want this thing to be a track weapon pulling up to 8000rpm and own the thursday night maccas illegal drag scene plus needs to give good gas mileage as its your daily drive and they'll give you a BS cam recommendation i.e. probably a gas miser economy grind...

I went with a cam from Wade Cams which was quite a bit smaller than what I had in mind. Since I sent them a genuine description of what the car was meant for I took their recommendation and couldn't be happier. Over the years I have sent off multiple cam recommendation sheets to the different cam builders and they all come back very similar for the same combo.

You will not go too far wrong with a cam recommendation if you have given the correct information!

Good luck with the engine it sounds like it could be a ripper!

Cheers,
Jason

[oldcorollas]

Brad, do you knwo when they start pumping up?
will it be a problem if the cam base circle is reduced, ie lifters usually sit lower in the bore by a few mm?

[tojo]

Some 5Ks came originally with solid lifters (13751-61020)
- crossreferences with some 3F landcruiser lifters

Match these with pushrods from a 4K with dished pistons like the 4k-u and regular 4K rockergear and youre set

[bmak]

Brad, do you knwo when they start pumping up?
will it be a problem if the cam base circle is reduced, ie lifters usually sit lower in the bore by a few mm?

Not sure but I was spinning the 5k to a little over 8k with a reground cam and no issues.