Anybody got any spare RV8 4.5 pistons...?

Anybody got any spare RV8 4.5 pistons...?

Author
Discussion

450Nick

Original Poster:

4,027 posts

211 months

Tuesday 15th April 2014
quotequote all
Just having my engine rebuilt and I've just heard that two of the pistons have some tiny cracks beside the valve cut outs and are probably not going to want to go back in... Before I buy a new set, does anyone have a couple knocking about?

OleVix

1,438 posts

147 months

Tuesday 15th April 2014
quotequote all
450Nick said:
Just having my engine rebuilt and I've just heard that two of the pistons have some tiny cracks beside the valve cut outs and are probably not going to want to go back in... Before I buy a new set, does anyone have a couple knocking about?
Peter phazed should have!

phazed

21,844 posts

203 months

Wednesday 16th April 2014
quotequote all
OleVix said:
450Nick said:
Just having my engine rebuilt and I've just heard that two of the pistons have some tiny cracks beside the valve cut outs and are probably not going to want to go back in... Before I buy a new set, does anyone have a couple knocking about?
Peter phazed should have!
Ive only got a full set of 4.0 pistons without the cutouts.

My spare 5.0s went last year.

QBee

20,904 posts

143 months

Wednesday 16th April 2014
quotequote all
http://www.pistonheads.com/classifieds/parts-and-p...

will these do? Griff 500, so gold coloured and complete with medallion and chest wig..... hehe

MADMAX2

2,336 posts

193 months

Wednesday 16th April 2014
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I wonder if macdeb has a spare pair? 4.5 pistons give him a message

db484bhpv8

8,655 posts

219 months

Wednesday 16th April 2014
quotequote all
phazed said:
Ive only got a full set of 4.0 pistons without the cutouts.
Have you a 4.6 bottom end also? scratchchin

450Nick

Original Poster:

4,027 posts

211 months

Wednesday 16th April 2014
quotequote all
Thanks for the response guys, yes I've seen the set on the classifieds, I'll give the engine builder a call and see if he likes the look of them... May as well change the pistons... So far the Chim's service (which started last summer) has included:

- Body off
- New outriggers
- New bushes
- New chassis bolts
- Painted Chassis
- Engine out
- New oil pump
- New water pump
- Piston rings
- Crank bearings
- New front pulley
- Dynamic crank/flywheel/pulley/clutch balance
- New blower cam
- New AP clutch
- Stage 3 ported heads, re-cut seats, new valve guides etc
- Machined inlet manifold to match heads
- 45mm trumpets
- Oil cooler & pipework
- Other stuff I've forgotten
- Pistons?!

Hopefully I'll get to drive it soon..!

db484bhpv8

8,655 posts

219 months

Wednesday 16th April 2014
quotequote all
I would fit 4.0 pistons if i had the choice wink

carsy

3,018 posts

164 months

Wednesday 16th April 2014
quotequote all
db484bhpv8 said:
I would fit 4.0 pistons if i had the choice wink
Its supercharged Derek.

db484bhpv8

8,655 posts

219 months

Wednesday 16th April 2014
quotequote all
carsy said:
db484bhpv8 said:
I would fit 4.0 pistons if i had the choice wink
Its supercharged Derek.
Sos mine kinda smile
Better off with the lower CR then

MADMAX2

2,336 posts

193 months

Wednesday 16th April 2014
quotequote all
450Nick said:
Thanks for the response guys, yes I've seen the set on the classifieds, I'll give the engine builder a call and see if he likes the look of them... May as well change the pistons... So far the Chim's service (which started last summer) has included:

- Body off
- New outriggers
- New bushes
- New chassis bolts
- Painted Chassis
- Engine out
- New oil pump
- New water pump
- Piston rings
- Crank bearings
- New front pulley
- Dynamic crank/flywheel/pulley/clutch balance
- New blower cam
- New AP clutch
- Stage 3 ported heads, re-cut seats, new valve guides etc
- Machined inlet manifold to match heads
- 45mm trumpets
- Oil cooler & pipework
- Other stuff I've forgotten
- Pistons?!

Hopefully I'll get to drive it soon..!


Lol seems a while ago Nick when you turned up to the very early days of the Bham tunnel run with white toothpaste still round your mouth !!!!

neal1980

2,574 posts

238 months

Wednesday 16th April 2014
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Macdeb has 8 with about 16000 miles on them. I will tell him your after some when I speak to him later.


db484bhpv8

8,655 posts

219 months

Wednesday 16th April 2014
quotequote all
neal1980 said:
Macdeb has 8 with about 16000 miles on them. I will tell him your after some when I speak to him later.
and i bet they look like they only have 160 miles on them. He changes the oil when it starts to discolour

450Nick

Original Poster:

4,027 posts

211 months

Wednesday 16th April 2014
quotequote all
neal1980 said:
Macdeb has 8 with about 16000 miles on them. I will tell him your after some when I speak to him later.
Great, thanks - Steve Howard is down at Power today getting my crank assembly balanced so he's going to have a word with Dom and see if he has anything to help out but if Mac has some that would be great... Apparently this problem is fairly common even on standard engines due to the design of the valve cutouts... Mine only has very tiny hairline cracks on two pistons after 80k miles so not too bad yet, but I'll have them replaced since it's apart.. Worth checking carefully if you have your engines apart...

Haha Ian - thanks for reminding me of that one! Yeah its been about 3 years now since I've driven mine - It's close to being back on the road now - I'm itching to drive it again, its been waaaaaay too long!

db484bhpv8

8,655 posts

219 months

Wednesday 16th April 2014
quotequote all
The 'TVR' cutout pistons are weak. Ive seen a lot simply collapse and break fron the corner of the cutout to the ringland. There simply isnt enough beef to cope with very high cylinder pressures. Or maybe its down to det. All i know is the non cutout 4.0 pistons are vastly stronger. other than that then forged pistons is the way forward.

phazed

21,844 posts

203 months

Wednesday 16th April 2014
quotequote all
db484bhpv8 said:
Have you a 4.6 bottom end also? scratchchin
No but I know a man that does.