View previous topic :: View next topic |
Author |
Message |
Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
|
Posted: Fri Sep 27, 2019 6:22 am Post subject: |
|
|
Juho wrote: | https://racingfuel.es/head-stud-kit-porsche-924-20-all-models-arp-complete-head-studs-n1?lang=en
Has anyone ordered from this site? |
Can’t find the part number, but I used ARP studs listed for Escort/Sierra Cosworth engines from a Ford specialist which were nearly half that price. _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
|
Back to top |
|
|
safe
Joined: 18 Mar 2017 Posts: 586 Location: Sweden
|
Posted: Fri Sep 27, 2019 6:26 am Post subject: |
|
|
I really don't see a need for arp head studs in an NA application. |
|
Back to top |
|
|
Juho
Joined: 03 Oct 2018 Posts: 377 Location: Finland
|
Posted: Fri Sep 27, 2019 6:42 am Post subject: |
|
|
Carrera RSR wrote: | Juho wrote: | https://racingfuel.es/head-stud-kit-porsche-924-20-all-models-arp-complete-head-studs-n1?lang=en
Has anyone ordered from this site? |
Can’t find the part number, but I used ARP studs listed for Escort/Sierra Cosworth engines from a Ford specialist which were nearly half that price. |
ARP 251-4701? found this part number on ideola's garage website |
|
Back to top |
|
|
Juho
Joined: 03 Oct 2018 Posts: 377 Location: Finland
|
Posted: Fri Sep 27, 2019 7:21 am Post subject: |
|
|
safe wrote: | I really don't see a need for arp head studs in an NA application. |
Arps would be obviously better but i think im going with elrings since they cost so much less |
|
Back to top |
|
|
MikeJinCO
Joined: 08 Jun 2010 Posts: 1228 Location: Maysville, Colorado
|
Posted: Wed Oct 02, 2019 10:34 pm Post subject: |
|
|
The ARP head studs are for a Ford Sierra Cosworth #251-4701 and are $135 from Summit racing or maybe 110E. The crankscraper guy is an absolute ripoff, I ordered and paid for two, got one. When I last checked he was not very healthy. Maybe a change by now.
When porting manifolds make your own gasket patterns, the gaskets are too big. enlarging to the gasket will make the air slow down then re accelerate. If using the stock CI exhaust manifold, grind it out to smooth it and match the head and header. It is a very poor and rough casting and very hard cast iron. Between 77 and 78 they added another cooling fin to the casting as my '77 did crack.
My 10+ CR race motor with mild cam, MSDS header and webers is at an entire different performance level, even with just guessing the proper carb jetting and timing. _________________ Mike
'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild) |
|
Back to top |
|
|
Juho
Joined: 03 Oct 2018 Posts: 377 Location: Finland
|
Posted: Wed Oct 02, 2019 11:25 pm Post subject: |
|
|
MikeJinCO wrote: | The ARP head studs are for a Ford Sierra Cosworth #251-4701 and are $135 from Summit racing or maybe 110E. The crankscraper guy is an absolute ripoff, I ordered and paid for two, got one. When I last checked he was not very healthy. Maybe a change by now.
When porting manifolds make your own gasket patterns, the gaskets are too big. enlarging to the gasket will make the air slow down then re accelerate. If using the stock CI exhaust manifold, grind it out to smooth it and match the head and header. It is a very poor and rough casting and very hard cast iron. Between 77 and 78 they added another cooling fin to the casting as my '77 did crack.
My 10+ CR race motor with mild cam, MSDS header and webers is at an entire different performance level, even with just guessing the proper carb jetting and timing. |
how much power you think your engine is making with those mods? |
|
Back to top |
|
|
MikeJinCO
Joined: 08 Jun 2010 Posts: 1228 Location: Maysville, Colorado
|
Posted: Thu Oct 03, 2019 3:03 am Post subject: |
|
|
I have no idea as to power, the car is probably 150-200kg lighter also. It is so different it is unbelievable, when accelerating in 3rd you get shoved back in the seat a bit,not the sedate acceleration as in a stock one. Since I think my street car has a blown head gasket it will get a Cometic head gasket and ARP studs when it goes back together, it is just better made parts. The old bolts are 40 years old and the new ones may be Chinese junk, having worked in the piston ring industry, aftermarket even brand name parts(particularly obsolete ones) basically have no quality control. It may cost more, but you only have to do it once. Also getting a thinner Cometic head gasket(.040 vs .065) increases the CR. I think it will be necessary to pull the hood using the ARP studs. _________________ Mike
'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild) |
|
Back to top |
|
|
daniel
Joined: 18 Jun 2009 Posts: 670 Location: Sydney, Australia
|
Posted: Tue Oct 15, 2019 11:01 am Post subject: |
|
|
My motor has 125rwhp (probably 150-160 at flywheel) with the following mods:
- Mild Cam (30/70 from paeco)
- Standard turbo head, valves and springs
- Cometic head gasket to give 11:1 compression
- custom forged flat top pistons
- polished rods (to remove weight)
- lightened flywheel
- bottom end balanced and blue printed
- basic port and polish job of head and inlet
- home made mandrel bend exhaust (not equal length due to RHD car and steering column interference)
10 years racing with only oil changes. _________________ Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
|
Back to top |
|
|
|